diff --git a/src/app/[locale]/layout.tsx b/src/app/[locale]/layout.tsx
index 5b44a26..4561f22 100644
--- a/src/app/[locale]/layout.tsx
+++ b/src/app/[locale]/layout.tsx
@@ -1,4 +1,5 @@
 import type { Metadata, Viewport } from "next";
+import Script from "next/script";
 import { notFound } from "next/navigation";
 import { getTranslations } from "next-intl/server";
 import { hasLocale, NextIntlClientProvider } from "next-intl";
@@ -82,7 +83,11 @@ export default async function RootLayout({
         suppressHydrationWarning
         className={inter.variable}
       >
-        <script dangerouslySetInnerHTML={{ __html: themeScript }} />
+        <Script
+          id="theme-init"
+          strategy="beforeInteractive"
+          dangerouslySetInnerHTML={{ __html: themeScript }}
+        />
         <NextIntlClientProvider locale={locale}>
           <NuqsAdapter>
             <ThemeProvider>
diff --git a/src/app/[locale]/page.tsx b/src/app/[locale]/page.tsx
index e518b28..b82ffea 100644
--- a/src/app/[locale]/page.tsx
+++ b/src/app/[locale]/page.tsx
@@ -387,21 +387,6 @@ function HomePageInner({ authEnabled, isAdmin }: HomePageInnerProps) {
             <HealthIndicator />
             <LocaleSwitcher />
             <ThemeToggle />
-            {authEnabled && (
-              <Button
-                variant="ghost"
-                size="icon"
-                onClick={signOut}
-                aria-label={t("signOut")}
-                title={t("signOut")}
-                className="size-8"
-              >
-                <LogOut
-                  className="size-4"
-                  aria-hidden="true"
-                />
-              </Button>
-            )}
             <Button
               variant="ghost"
               size="icon"
@@ -427,21 +412,30 @@ function HomePageInner({ authEnabled, isAdmin }: HomePageInnerProps) {
                 <Button
                   variant="ghost"
                   size="icon"
-                  aria-label={t("configuration")}
-                  title={t("configuration")}
+                  aria-label={authEnabled ? t("account") : t("configuration")}
+                  title={authEnabled ? t("account") : t("configuration")}
                   className="size-8"
                 >
-                  <Settings
-                    className="size-5"
-                    aria-hidden="true"
-                  />
+                  {authEnabled ? (
+                    <UserRound
+                      className="size-5"
+                      aria-hidden="true"
+                    />
+                  ) : (
+                    <Settings
+                      className="size-5"
+                      aria-hidden="true"
+                    />
+                  )}
                 </Button>
               </DropdownMenuTrigger>
               <DropdownMenuContent
                 align="end"
                 className="w-52"
               >
-                <DropdownMenuLabel>{t("configuration")}</DropdownMenuLabel>
+                <DropdownMenuLabel>
+                  {authEnabled ? t("account") : t("configuration")}
+                </DropdownMenuLabel>
                 <DropdownMenuGroup>
                   {authEnabled && (
                     <>
@@ -477,6 +471,20 @@ function HomePageInner({ authEnabled, isAdmin }: HomePageInnerProps) {
                     </DropdownMenuItem>
                   )}
                 </DropdownMenuGroup>
+                {authEnabled && (
+                  <>
+                    <DropdownMenuSeparator />
+                    <DropdownMenuGroup>
+                      <DropdownMenuItem
+                        className="text-destructive"
+                        onSelect={() => void signOut()}
+                      >
+                        <LogOut aria-hidden="true" />
+                        {t("signOut")}
+                      </DropdownMenuItem>
+                    </DropdownMenuGroup>
+                  </>
+                )}
               </DropdownMenuContent>
             </DropdownMenu>
           </div>
diff --git a/src/app/components/AccountDialog.tsx b/src/app/components/AccountDialog.tsx
index f4ec090..fdee8b4 100644
--- a/src/app/components/AccountDialog.tsx
+++ b/src/app/components/AccountDialog.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
 import {
   Dialog,
   DialogContent,
@@ -18,6 +19,8 @@ interface AccountDialogProps {
 }
 
 export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
+  const t = useTranslations("dialogs.account");
+  const tCommon = useTranslations("common");
   const [account, setAccount] = useState<{
     username: string;
     role: "admin" | "user";
@@ -45,9 +48,7 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
         } | null;
         if (!response.ok || typeof body?.username !== "string") {
           throw new Error(
-            typeof body?.error === "string"
-              ? body.error
-              : "Account information is unavailable."
+            typeof body?.error === "string" ? body.error : t("unavailable")
           );
         }
         return {
@@ -60,11 +61,7 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
       })
       .catch((reason: unknown) => {
         if (!cancelled) {
-          setError(
-            reason instanceof Error
-              ? reason.message
-              : "Account information is unavailable."
-          );
+          setError(reason instanceof Error ? reason.message : t("unavailable"));
         }
       })
       .finally(() => {
@@ -74,7 +71,7 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
     return () => {
       cancelled = true;
     };
-  }, [open]);
+  }, [open, t]);
 
   return (
     <Dialog
@@ -83,19 +80,19 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
     >
       <DialogContent className="sm:max-w-lg">
         <DialogHeader>
-          <DialogTitle>User information</DialogTitle>
-          <DialogDescription>
-            Your signed-in account for this workspace.
-          </DialogDescription>
+          <DialogTitle>{t("title")}</DialogTitle>
+          <DialogDescription>{t("description")}</DialogDescription>
         </DialogHeader>
         <section
-          aria-label="Account details"
+          aria-label={t("detailsLabel")}
           className="rounded-md border border-border px-4 py-3"
         >
-          <p className="text-xs font-medium text-muted-foreground">Username</p>
+          <p className="text-xs font-medium text-muted-foreground">
+            {t("username")}
+          </p>
           {loading || (!error && account === null) ? (
             <p className="mt-1 text-sm text-muted-foreground">
-              Loading account...
+              {t("loading")}
             </p>
           ) : error ? (
             <p
@@ -108,7 +105,7 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
             <p className="mt-1 break-words text-sm font-medium text-foreground">
               {account.username}
               <span className="ml-2 rounded bg-accent px-1.5 py-0.5 text-xs font-normal text-muted-foreground">
-                {account.role}
+                {account.role === "admin" ? t("roles.admin") : t("roles.user")}
               </span>
             </p>
           ) : null}
@@ -121,7 +118,7 @@ export function AccountDialog({ open, onOpenChange }: AccountDialogProps) {
             type="button"
             onClick={() => onOpenChange(false)}
           >
-            Close
+            {tCommon("close")}
           </Button>
         </DialogFooter>
       </DialogContent>
diff --git a/src/app/components/ChangePasswordDialog.tsx b/src/app/components/ChangePasswordDialog.tsx
index 492aada..5340c5e 100644
--- a/src/app/components/ChangePasswordDialog.tsx
+++ b/src/app/components/ChangePasswordDialog.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { FormEvent, useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
 import {
   Dialog,
   DialogContent,
@@ -22,6 +23,7 @@ export function ChangePasswordDialog({
   open,
   onOpenChange,
 }: ChangePasswordDialogProps) {
+  const t = useTranslations("changePassword");
   const [currentPassword, setCurrentPassword] = useState("");
   const [newPassword, setNewPassword] = useState("");
   const [confirmPassword, setConfirmPassword] = useState("");
@@ -58,12 +60,12 @@ export function ChangePasswordDialog({
         error?: string;
       };
       if (!response.ok) {
-        throw new Error(body.error || "Unable to change the password.");
+        throw new Error(body.error || t("failed"));
       }
       onOpenChange(false);
     } catch (reason) {
       setError(
-        reason instanceof Error ? reason.message : "Unable to change the password."
+        reason instanceof Error ? reason.message : t("failed")
       );
       setSaving(false);
     }
@@ -73,15 +75,12 @@ export function ChangePasswordDialog({
     <Dialog open={open} onOpenChange={onOpenChange}>
       <DialogContent className="sm:max-w-md">
         <DialogHeader>
-          <DialogTitle>Change Password</DialogTitle>
-          <DialogDescription>
-            Changing the password signs out every existing session except this
-            one.
-          </DialogDescription>
+          <DialogTitle>{t("title")}</DialogTitle>
+          <DialogDescription>{t("description")}</DialogDescription>
         </DialogHeader>
         <form method="post" onSubmit={submit} className="space-y-4">
           <div className="space-y-1.5">
-            <Label htmlFor="current-password">Current password</Label>
+            <Label htmlFor="current-password">{t("currentPassword")}</Label>
             <Input
               id="current-password"
               type="password"
@@ -94,7 +93,7 @@ export function ChangePasswordDialog({
             />
           </div>
           <div className="space-y-1.5">
-            <Label htmlFor="new-password">New password</Label>
+            <Label htmlFor="new-password">{t("newPassword")}</Label>
             <Input
               id="new-password"
               type="password"
@@ -107,7 +106,7 @@ export function ChangePasswordDialog({
             />
           </div>
           <div className="space-y-1.5">
-            <Label htmlFor="confirm-password">Confirm new password</Label>
+            <Label htmlFor="confirm-password">{t("confirmPassword")}</Label>
             <Input
               id="confirm-password"
               type="password"
@@ -131,10 +130,10 @@ export function ChangePasswordDialog({
               onClick={() => onOpenChange(false)}
               disabled={saving}
             >
-              Cancel
+              {t("cancel")}
             </Button>
             <Button type="submit" disabled={saving}>
-              {saving ? "Saving..." : "Save Password"}
+              {saving ? t("saving") : t("submit")}
             </Button>
           </DialogFooter>
         </form>
diff --git a/src/app/components/ConfigDialog.tsx b/src/app/components/ConfigDialog.tsx
index 229ed9b..57e4c82 100644
--- a/src/app/components/ConfigDialog.tsx
+++ b/src/app/components/ConfigDialog.tsx
@@ -1,4 +1,5 @@
 "use client";
+import { useTranslations } from "next-intl";
 import {
   Dialog,
   DialogContent,
@@ -18,6 +19,7 @@ interface ConfigDialogProps {
 }
 
 export function ConfigDialog({ open, onOpenChange }: ConfigDialogProps) {
+  const t = useTranslations("modelConfig");
   // The hook owns the UI-preference localStorage round-trip.
   const { value: collapseAgentActions, setValue: setCollapseAgentActions } =
     useCollapseAgentActions();
@@ -34,11 +36,8 @@ export function ConfigDialog({ open, onOpenChange }: ConfigDialogProps) {
         onEscapeKeyDown={(event) => event.preventDefault()}
       >
         <DialogHeader>
-          <DialogTitle>Model registry</DialogTitle>
-          <DialogDescription>
-            Manage providers, models, credentials and defaults. Admin only;
-            every save is validated by the backend.
-          </DialogDescription>
+          <DialogTitle>{t("title")}</DialogTitle>
+          <DialogDescription>{t("description")}</DialogDescription>
         </DialogHeader>
         {open && <RegistryEditor />}
         <div className="flex items-start gap-2">
@@ -47,18 +46,18 @@ export function ConfigDialog({ open, onOpenChange }: ConfigDialogProps) {
             type="checkbox"
             checked={collapseAgentActions}
             onChange={(e) => setCollapseAgentActions(e.target.checked)}
-            aria-label="Collapse agent actions by default"
+            aria-label={t("collapseAgentActions")}
             className="mt-1 size-4 rounded border-border accent-[var(--brand)]"
           />
           <Label
             htmlFor="collapseAgentActions"
             className="text-sm font-normal leading-snug"
           >
-            Collapse agent actions by default
+            {t("collapseAgentActions")}
           </Label>
         </div>
         <DialogFooter>
-          <Button onClick={() => onOpenChange(false)}>Close</Button>
+          <Button onClick={() => onOpenChange(false)}>{t("close")}</Button>
         </DialogFooter>
       </DialogContent>
     </Dialog>
diff --git a/src/app/components/ImageModelsDialog.tsx b/src/app/components/ImageModelsDialog.tsx
index 64016a1..ab6d482 100644
--- a/src/app/components/ImageModelsDialog.tsx
+++ b/src/app/components/ImageModelsDialog.tsx
@@ -1,4 +1,5 @@
 "use client";
+import { useTranslations } from "next-intl";
 import {
   Dialog,
   DialogContent,
@@ -16,6 +17,7 @@ interface ImageModelsDialogProps {
 }
 
 export function ImageModelsDialog({ open, onOpenChange }: ImageModelsDialogProps) {
+  const t = useTranslations("imageModels");
   return (
     <Dialog
       open={open}
@@ -28,15 +30,12 @@ export function ImageModelsDialog({ open, onOpenChange }: ImageModelsDialogProps
         onEscapeKeyDown={(event) => event.preventDefault()}
       >
         <DialogHeader>
-          <DialogTitle>Image models</DialogTitle>
-          <DialogDescription>
-            Manage dedicated image-generation models (stored in config.yaml).
-            Admin only.
-          </DialogDescription>
+          <DialogTitle>{t("title")}</DialogTitle>
+          <DialogDescription>{t("description")}</DialogDescription>
         </DialogHeader>
         {open && <ImageModelsEditor />}
         <DialogFooter>
-          <Button onClick={() => onOpenChange(false)}>Close</Button>
+          <Button onClick={() => onOpenChange(false)}>{t("close")}</Button>
         </DialogFooter>
       </DialogContent>
     </Dialog>
diff --git a/src/app/components/ImageModelsEditor.tsx b/src/app/components/ImageModelsEditor.tsx
index 9de2e5e..4c48f9e 100644
--- a/src/app/components/ImageModelsEditor.tsx
+++ b/src/app/components/ImageModelsEditor.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useCallback, useEffect, useMemo, useState } from "react";
+import { useTranslations } from "next-intl";
 import { Eye, EyeOff } from "lucide-react";
 import { toast } from "sonner";
 import { errorToast } from "@/lib/errorReporter";
@@ -80,7 +81,7 @@ function toDraftState(settings: ImageGenerationSettings): DraftState {
 
 type ParsedParams =
   | { ok: true; value: Record<string, unknown> }
-  | { ok: false; message: string };
+  | { ok: false; code: "notObject" | "invalidJson" };
 
 function parseParams(text: string): ParsedParams {
   const trimmed = text.trim();
@@ -88,11 +89,11 @@ function parseParams(text: string): ParsedParams {
   try {
     const parsed: unknown = JSON.parse(trimmed);
     if (parsed === null || typeof parsed !== "object" || Array.isArray(parsed)) {
-      return { ok: false, message: "params must be a JSON object" };
+      return { ok: false, code: "notObject" };
     }
     return { ok: true, value: parsed as Record<string, unknown> };
   } catch {
-    return { ok: false, message: "invalid JSON" };
+    return { ok: false, code: "invalidJson" };
   }
 }
 
@@ -137,8 +138,11 @@ function ImageModelCard({
   const [showKey, setShowKey] = useState(false);
   const [testing, setTesting] = useState(false);
   const [outcome, setOutcome] = useState<TestOutcome | null>(null);
+  const t = useTranslations("imageModels");
   const paramsResult = parseParams(model.paramsText);
-  const paramsError = paramsResult.ok ? null : paramsResult.message;
+  const paramsError = paramsResult.ok
+    ? null
+    : t(`card.paramsErrors.${paramsResult.code}`);
 
   const runTest = async () => {
     if (!paramsResult.ok) return;
@@ -158,15 +162,21 @@ function ImageModelCard({
       });
       setOutcome({ ok: true, latencyMs: result.latency_ms });
       toast.success(
-        `${model.id || "Image model"} passed the test in ${(result.latency_ms / 1000).toFixed(1)} s.`
+        t("card.testPassed", {
+          id: model.id || t("card.unnamed"),
+          seconds: (result.latency_ms / 1000).toFixed(1),
+        })
       );
     } catch (reason) {
       const message =
-        reason instanceof Error ? reason.message : "Test failed.";
+        reason instanceof Error ? reason.message : t("card.testFailedGeneric");
       setOutcome({ ok: false, message });
       errorToast(
         "models.image-test",
-        `${model.id || "Image model"} failed the test: ${message}`
+        t("card.testFailedToast", {
+          id: model.id || t("card.unnamed"),
+          message,
+        })
       );
     } finally {
       setTesting(false);
@@ -177,7 +187,7 @@ function ImageModelCard({
     <div className="space-y-2 rounded-md border border-border p-3">
       <div className="flex flex-wrap items-center gap-2">
         <span className="font-mono text-sm font-medium">
-          {model.id || "(new model)"}
+          {model.id || t("card.newModel")}
         </span>
         <span className="rounded bg-accent px-1.5 py-0.5 text-[11px] text-muted-foreground">
           {model.provider}
@@ -191,7 +201,7 @@ function ImageModelCard({
               onChange({ ...model, enabled: event.target.checked })
             }
           />
-          enabled
+          {t("card.enabled")}
         </label>
         <Button
           type="button"
@@ -199,34 +209,33 @@ function ImageModelCard({
           size="sm"
           disabled={testing || paramsError !== null}
           title={
-            paramsError
-              ? "Fix the invalid params JSON before testing."
-              : undefined
+            paramsError ? t("card.fixParamsBeforeTesting") : undefined
           }
           onClick={() => void runTest()}
         >
-          {testing ? "Testing…" : "Test"}
+          {testing ? t("card.testing") : t("card.test")}
         </Button>
         <Button type="button" variant="outline" size="sm" onClick={onRemove}>
-          Remove
+          {t("card.remove")}
         </Button>
       </div>
       {outcome &&
         (outcome.ok ? (
           <p className="rounded-md border border-emerald-600/30 bg-emerald-600/5 px-2 py-1 text-xs text-emerald-700 dark:text-emerald-400">
-            Test passed in {(outcome.latencyMs / 1000).toFixed(1)} s — the
-            provider completed a real generation with these settings.
+            {t("card.testPassedBanner", {
+              seconds: (outcome.latencyMs / 1000).toFixed(1),
+            })}
           </p>
         ) : (
           <p
             role="alert"
             className="rounded-md border border-destructive/30 bg-destructive/5 px-2 py-1 text-xs text-destructive"
           >
-            Test failed: {outcome.message}
+            {t("card.testFailedBanner", { message: outcome.message })}
           </p>
         ))}
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Model id">
+        <Field label={t("card.modelId")}>
           <input
             type="text"
             className={inputClass}
@@ -234,7 +243,7 @@ function ImageModelCard({
             onChange={(event) => onChange({ ...model, id: event.target.value })}
           />
         </Field>
-        <Field label="Display name">
+        <Field label={t("card.displayName")}>
           <input
             type="text"
             className={inputClass}
@@ -244,7 +253,7 @@ function ImageModelCard({
             }
           />
         </Field>
-        <Field label="Provider">
+        <Field label={t("card.provider")}>
           <select
             className={inputClass}
             value={model.provider}
@@ -260,7 +269,7 @@ function ImageModelCard({
           </select>
         </Field>
       </div>
-      <Field label="Base URL">
+      <Field label={t("card.baseUrl")}>
         <input
           type="text"
           className={inputClass}
@@ -272,7 +281,7 @@ function ImageModelCard({
         />
       </Field>
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Default size">
+        <Field label={t("card.defaultSize")}>
           <select
             className={inputClass}
             value={model.default_size}
@@ -290,7 +299,7 @@ function ImageModelCard({
             )}
           </select>
         </Field>
-        <Field label="Default quality">
+        <Field label={t("card.defaultQuality")}>
           <input
             type="text"
             className={inputClass}
@@ -302,11 +311,15 @@ function ImageModelCard({
           />
         </Field>
         <Field
-          label="API Key"
+          label={t("card.apiKey")}
           hint={
             model.api_key_configured
-              ? `configured${model.api_key_hint ? ` (${model.api_key_hint})` : ""} — leave blank to keep`
-              : "paste your API key"
+              ? model.api_key_hint
+                ? t("card.apiKeyConfiguredWithHint", {
+                    hint: model.api_key_hint,
+                  })
+                : t("card.apiKeyConfiguredNoHint")
+              : t("card.apiKeyNotConfigured")
           }
         >
           <div className="relative">
@@ -322,7 +335,7 @@ function ImageModelCard({
             />
             <button
               type="button"
-              aria-label={showKey ? "Hide API key" : "Show API key"}
+              aria-label={showKey ? t("card.hideApiKey") : t("card.showApiKey")}
               className="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
               onClick={() => setShowKey((current) => !current)}
             >
@@ -331,7 +344,7 @@ function ImageModelCard({
           </div>
         </Field>
       </div>
-      <Field label="Params (JSON object, optional)">
+      <Field label={t("card.paramsLabel")}>
         <textarea
           className={`${inputClass} font-mono text-xs`}
           rows={2}
@@ -345,7 +358,7 @@ function ImageModelCard({
       </Field>
       {paramsError && (
         <p role="alert" className="text-[11px] text-destructive">
-          Params: {paramsError}
+          {t("card.paramsErrorPrefix", { message: paramsError })}
         </p>
       )}
     </div>
@@ -358,6 +371,7 @@ export function ImageModelsEditor() {
   const [loadError, setLoadError] = useState<string | null>(null);
   const [forbidden, setForbidden] = useState(false);
   const [saving, setSaving] = useState(false);
+  const t = useTranslations("imageModels");
 
   const load = useCallback(async () => {
     setLoadError(null);
@@ -368,16 +382,14 @@ export function ImageModelsEditor() {
       setDraft(toDraftState(settings));
     } catch (reason) {
       const message =
-        reason instanceof Error
-          ? reason.message
-          : "Failed to load image models.";
+        reason instanceof Error ? reason.message : t("loadFailed");
       if (message.includes("(403)")) {
         setForbidden(true);
       } else {
         setLoadError(message);
       }
     }
-  }, []);
+  }, [t]);
 
   useEffect(() => {
     void load();
@@ -394,7 +406,7 @@ export function ImageModelsEditor() {
     if (!draft) return;
     const payload = buildPayload(draft);
     if (!payload) {
-      toast.error("Fix the invalid params JSON before saving.");
+      toast.error(t("fixParamsBeforeSaving"));
       return;
     }
     setSaving(true);
@@ -402,21 +414,21 @@ export function ImageModelsEditor() {
       const saved = await putImageGeneration(payload);
       setData(saved);
       setDraft(toDraftState(saved));
-      toast.success("Image models saved.");
+      toast.success(t("saved"));
     } catch (reason) {
       errorToast(
         "models.image-save",
-        reason instanceof Error ? reason.message : "Failed to save image models."
+        reason instanceof Error ? reason.message : t("saveFailed")
       );
     } finally {
       setSaving(false);
     }
-  }, [draft]);
+  }, [draft, t]);
 
   if (forbidden) {
     return (
       <p className="rounded-md border border-border px-4 py-3 text-sm text-muted-foreground">
-        Image model configuration requires an admin account.
+        {t("forbidden")}
       </p>
     );
   }
@@ -430,13 +442,13 @@ export function ImageModelsEditor() {
           size="sm"
           onClick={() => void load()}
         >
-          Retry
+          {t("retry")}
         </Button>
       </div>
     );
   }
   if (!data || !draft) {
-    return <p className="text-sm text-muted-foreground">Loading image models…</p>;
+    return <p className="text-sm text-muted-foreground">{t("loading")}</p>;
   }
 
   const defaultOptions = draft.models.map((model) => model.id);
@@ -444,7 +456,7 @@ export function ImageModelsEditor() {
   return (
     <div className="space-y-4">
       <div className="grid grid-cols-1 gap-2 rounded-lg border border-border p-4 sm:grid-cols-2">
-        <Field label="Default model">
+        <Field label={t("defaultModel")}>
           <select
             className={inputClass}
             value={draft.default_model}
@@ -452,7 +464,7 @@ export function ImageModelsEditor() {
               setDraft({ ...draft, default_model: event.target.value })
             }
           >
-            <option value="">— none —</option>
+            <option value="">{t("none")}</option>
             {defaultOptions.map((id) => (
               <option key={id} value={id}>
                 {id}
@@ -466,7 +478,7 @@ export function ImageModelsEditor() {
               )}
           </select>
         </Field>
-        <Field label="Timeout (s)">
+        <Field label={t("timeoutSeconds")}>
           <input
             type="number"
             className={inputClass}
@@ -484,7 +496,7 @@ export function ImageModelsEditor() {
 
       <div className="space-y-2">
         <div className="flex items-center justify-between">
-          <p className="text-xs font-medium text-muted-foreground">Models</p>
+          <p className="text-xs font-medium text-muted-foreground">{t("modelsHeading")}</p>
           <Button
             type="button"
             variant="outline"
@@ -505,11 +517,11 @@ export function ImageModelsEditor() {
               })
             }
           >
-            Add model
+            {t("addModel")}
           </Button>
         </div>
         {draft.models.length === 0 && (
-          <p className="text-xs text-muted-foreground">No models yet.</p>
+          <p className="text-xs text-muted-foreground">{t("empty")}</p>
         )}
         {draft.models.map((model, index) => (
           <ImageModelCard
@@ -539,7 +551,7 @@ export function ImageModelsEditor() {
           onClick={() => void save()}
           disabled={saving || !dirty}
         >
-          {saving ? "Saving…" : "Save"}
+          {saving ? t("saving") : t("save")}
         </Button>
         <Button
           type="button"
@@ -547,16 +559,16 @@ export function ImageModelsEditor() {
           disabled={saving || !dirty}
           onClick={() => setDraft(toDraftState(data))}
         >
-          Discard changes
+          {t("discardChanges")}
         </Button>
         {dirty && (
           <span className="rounded bg-[var(--color-warning)]/10 px-1.5 py-0.5 text-xs text-[var(--color-warning)]">
-            unsaved changes
+            {t("unsavedChanges")}
           </span>
         )}
       </div>
       <p className="text-[11px] text-muted-foreground">
-        API keys are write-only: leave the field blank to keep the stored key.
+        {t("apiKeyWriteOnlyNote")}
       </p>
     </div>
   );
diff --git a/src/app/components/RegistryEditor.tsx b/src/app/components/RegistryEditor.tsx
index c34c4b8..0198e51 100644
--- a/src/app/components/RegistryEditor.tsx
+++ b/src/app/components/RegistryEditor.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useCallback, useEffect, useMemo, useState } from "react";
+import { useTranslations } from "next-intl";
 import { ChevronDown, ChevronRight, Eye, EyeOff } from "lucide-react";
 import { toast } from "sonner";
 import { errorToast } from "@/lib/errorReporter";
@@ -43,7 +44,10 @@ interface ApiErrorBody {
   details?: unknown;
 }
 
-async function readApiError(response: Response): Promise<{
+async function readApiError(
+  response: Response,
+  fallbackMessage?: (status: number) => string
+): Promise<{
   message: string;
   code: string | null;
   details: Array<{ path?: string; code?: string }>;
@@ -53,7 +57,8 @@ async function readApiError(response: Response): Promise<{
     message:
       typeof body?.message === "string"
         ? body.message
-        : `Request failed (${response.status}).`,
+        : fallbackMessage?.(response.status) ??
+          `Request failed (${response.status}).`,
     code: typeof body?.code === "string" ? body.code : null,
     details: Array.isArray(body?.details)
       ? (body.details as Array<{ path?: string; code?: string }>)
@@ -68,7 +73,8 @@ type PutRegistryResult =
   | { ok: false; status: number; error: ApiErrorInfo };
 
 async function putRegistry(
-  payload: PutModelRegistryRequest
+  payload: PutModelRegistryRequest,
+  fallbackMessage?: (status: number) => string
 ): Promise<PutRegistryResult> {
   const response = await fetch("/api/model-registry", {
     method: "PUT",
@@ -79,7 +85,7 @@ async function putRegistry(
     return {
       ok: false,
       status: response.status,
-      error: await readApiError(response),
+      error: await readApiError(response, fallbackMessage),
     };
   }
   return { ok: true, body: (await response.json()) as GetModelRegistryResponse };
@@ -121,10 +127,15 @@ function NumberField({
   nullable?: boolean;
   disabled?: boolean;
 }) {
+  const t = useTranslations("modelConfig");
   const hint = rule
     ? [
-        rule.minimum != null ? `min ${rule.minimum}` : null,
-        rule.maximum != null ? `max ${rule.maximum}` : null,
+        rule.minimum != null
+          ? t("registry.minHint", { value: rule.minimum })
+          : null,
+        rule.maximum != null
+          ? t("registry.maxHint", { value: rule.maximum })
+          : null,
       ]
         .filter(Boolean)
         .join(" · ") || undefined
@@ -139,7 +150,7 @@ function NumberField({
         max={rule?.maximum ?? undefined}
         step={rule?.value_type === "integer" ? 1 : "any"}
         disabled={disabled || rule?.supported === false}
-        placeholder={nullable ? "inherit" : undefined}
+        placeholder={nullable ? t("registry.inheritPlaceholder") : undefined}
         onChange={(event) => {
           const raw = event.target.value;
           if (raw === "" && nullable) {
@@ -162,11 +173,12 @@ function AvailabilityBadge({
   data: GetModelRegistryResponse;
   ref_: ModelRef;
 }) {
+  const t = useTranslations("modelConfig");
   const status = availabilityFor(data, ref_);
   if (!status) {
     return (
       <span className="rounded bg-accent px-1.5 py-0.5 text-[11px] text-muted-foreground">
-        new
+        {t("registry.statusNew")}
       </span>
     );
   }
@@ -194,6 +206,7 @@ function ModelStatusDot({
   data: GetModelRegistryResponse;
   ref_: ModelRef;
 }) {
+  const t = useTranslations("modelConfig");
   const status = availabilityFor(data, ref_);
   const state = status?.state ?? null;
   const color =
@@ -207,7 +220,7 @@ function ModelStatusDot({
   return (
     <span
       className={`inline-block size-2 rounded-full ${color}`}
-      title={`${ref_.model_key}: ${state ?? "new"}`}
+      title={`${ref_.model_key}: ${state ?? t("registry.statusNew")}`}
     />
   );
 }
@@ -235,6 +248,7 @@ function ModelEditor({
   onRemove: () => void;
   onTest: () => void;
 }) {
+  const t = useTranslations("modelConfig");
   const ref: ModelRef = { provider_id: provider.id, model_key: model.key };
   const rule = (name: string) => spec?.parameters[name] ?? null;
   const runtime = model.runtime;
@@ -246,6 +260,14 @@ function ModelEditor({
     () => availabilityFor(data, ref) === null
   );
   const [showAdvanced, setShowAdvanced] = useState(false);
+  const capabilityLabels: Record<
+    "tools" | "vision" | "structured_output",
+    string
+  > = {
+    tools: t("registry.capabilityTools"),
+    vision: t("registry.capabilityVision"),
+    structured_output: t("registry.capabilityStructuredOutput"),
+  };
   const capability = (key: "tools" | "vision" | "structured_output") => {
     const protocolAllows = spec?.protocol_capabilities[key] !== false;
     return (
@@ -263,7 +285,7 @@ function ModelEditor({
             })
           }
         />
-        {key.replace("_", " ")}
+        {capabilityLabels[key]}
       </label>
     );
   };
@@ -274,7 +296,7 @@ function ModelEditor({
         <button
           type="button"
           aria-expanded={expanded}
-          aria-label={`Toggle parameters for ${model.key}`}
+          aria-label={t("registry.toggleParameters", { key: model.key })}
           className="text-muted-foreground hover:text-foreground"
           onClick={() => setExpanded((current) => !current)}
         >
@@ -295,30 +317,26 @@ function ModelEditor({
               onChange({ ...model, enabled: event.target.checked })
             }
           />
-          enabled
+          {t("registry.enabled")}
         </label>
         <Button
           type="button"
           variant="outline"
           size="sm"
           disabled={testing || dirty}
-          title={
-            dirty
-              ? "Save the registry before testing (tests only run against saved models)."
-              : undefined
-          }
+          title={dirty ? t("registry.saveBeforeTesting") : undefined}
           onClick={onTest}
         >
-          {testing ? "Testing…" : "Test"}
+          {testing ? t("registry.testing") : t("registry.test")}
         </Button>
         <Button type="button" variant="outline" size="sm" onClick={onRemove}>
-          Remove
+          {t("registry.remove")}
         </Button>
       </div>
       {expanded && (
         <>
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Model key">
+        <Field label={t("registry.modelKey")}>
           <input
             type="text"
             className={inputClass}
@@ -329,7 +347,7 @@ function ModelEditor({
             }
           />
         </Field>
-        <Field label="Display name">
+        <Field label={t("registry.displayName")}>
           <input
             type="text"
             className={inputClass}
@@ -339,7 +357,7 @@ function ModelEditor({
             }
           />
         </Field>
-        <Field label="Upstream model id">
+        <Field label={t("registry.upstreamModelId")}>
           <input
             type="text"
             className={inputClass}
@@ -352,13 +370,13 @@ function ModelEditor({
       </div>
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
         <NumberField
-          label="Context window"
+          label={t("registry.contextWindow")}
           value={runtime.context_window_tokens}
           nullable
           onChange={(value) => setRuntime({ context_window_tokens: value })}
         />
         <NumberField
-          label="Max output tokens"
+          label={t("registry.maxOutputTokens")}
           value={runtime.max_output_tokens}
           rule={rule("max_output_tokens")}
           onChange={(value) =>
@@ -366,7 +384,11 @@ function ModelEditor({
           }
         />
         <NumberField
-          label={rule("temperature")?.supported === false ? "Temperature (unsupported)" : "Temperature"}
+          label={
+            rule("temperature")?.supported === false
+              ? t("registry.temperatureUnsupported")
+              : t("registry.temperature")
+          }
           value={runtime.temperature}
           nullable
           rule={rule("temperature")}
@@ -375,7 +397,7 @@ function ModelEditor({
       </div>
       <div className="flex items-center gap-4">
         <span className="text-xs font-medium text-muted-foreground">
-          Capabilities
+          {t("registry.capabilities")}
         </span>
         {capability("tools")}
         {capability("vision")}
@@ -393,11 +415,11 @@ function ModelEditor({
           ) : (
             <ChevronRight className="size-3.5" aria-hidden="true" />
           )}
-          Advanced
+          {t("registry.advanced")}
         </button>
         {showAdvanced && (
       <div className="mt-2 grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Limit mode">
+        <Field label={t("registry.limitMode")}>
           <select
             className={inputClass}
             value={runtime.limit_mode}
@@ -412,40 +434,40 @@ function ModelEditor({
           </select>
         </Field>
         <NumberField
-          label="Max input tokens"
+          label={t("registry.maxInputTokens")}
           value={runtime.max_input_tokens}
           nullable
           onChange={(value) => setRuntime({ max_input_tokens: value })}
         />
         <NumberField
-          label="Min effective input"
+          label={t("registry.minEffectiveInput")}
           value={runtime.min_effective_input_tokens}
           onChange={(value) =>
             setRuntime({ min_effective_input_tokens: value ?? 0 })
           }
         />
         <NumberField
-          label="System reserve"
+          label={t("registry.systemReserve")}
           value={runtime.fixed_system_reserve_tokens}
           onChange={(value) =>
             setRuntime({ fixed_system_reserve_tokens: value ?? 0 })
           }
         />
         <NumberField
-          label="Tools reserve"
+          label={t("registry.toolsReserve")}
           value={runtime.fixed_tools_reserve_tokens}
           onChange={(value) =>
             setRuntime({ fixed_tools_reserve_tokens: value ?? 0 })
           }
         />
         <NumberField
-          label="Attachments reserve"
+          label={t("registry.attachmentsReserve")}
           value={runtime.fixed_attachments_reserve_tokens}
           onChange={(value) =>
             setRuntime({ fixed_attachments_reserve_tokens: value ?? 0 })
           }
         />
-        <Field label="Limits status">
+        <Field label={t("registry.limitsStatus")}>
           <select
             className={inputClass}
             value={runtime.limits_status}
@@ -458,11 +480,15 @@ function ModelEditor({
               })
             }
           >
-            <option value="needs_confirmation">needs confirmation</option>
-            <option value="confirmed">confirmed</option>
+            <option value="needs_confirmation">
+              {t("registry.limitsStatusNeedsConfirmation")}
+            </option>
+            <option value="confirmed">
+              {t("registry.limitsStatusConfirmed")}
+            </option>
           </select>
         </Field>
-        <Field label="Limits source">
+        <Field label={t("registry.limitsSource")}>
           <select
             className={inputClass}
             value={runtime.limits_source}
@@ -476,13 +502,17 @@ function ModelEditor({
               })
             }
           >
-            <option value="user">user</option>
-            <option value="provider">provider</option>
-            <option value="tested_contract">tested contract</option>
+            <option value="user">{t("registry.limitsSourceUser")}</option>
+            <option value="provider">
+              {t("registry.limitsSourceProvider")}
+            </option>
+            <option value="tested_contract">
+              {t("registry.limitsSourceTestedContract")}
+            </option>
           </select>
         </Field>
         <NumberField
-          label="Top p"
+          label={t("registry.topP")}
           value={runtime.top_p}
           nullable
           rule={rule("top_p")}
@@ -491,8 +521,8 @@ function ModelEditor({
         <Field
           label={
             rule("reasoning_effort")?.supported === false
-              ? "Reasoning effort (unsupported)"
-              : "Reasoning effort"
+              ? t("registry.reasoningEffortUnsupported")
+              : t("registry.reasoningEffort")
           }
         >
           <select
@@ -534,9 +564,11 @@ function ModelEditor({
           {outcome.ok ? (
             <>
               <p>
-                Test passed in {outcome.result.latency_ms} ms — adapter spec
-                revision {outcome.result.adapter_spec_revision}, state{" "}
-                {outcome.result.model_status.state}.
+                {t("registry.testPassedBanner", {
+                  latencyMs: outcome.result.latency_ms,
+                  revision: outcome.result.adapter_spec_revision,
+                  state: outcome.result.model_status.state,
+                })}
               </p>
               <pre className="mt-1 overflow-x-auto font-mono text-[11px]">
                 {JSON.stringify(outcome.result.effective_request_options, null, 2)}
@@ -544,8 +576,10 @@ function ModelEditor({
             </>
           ) : (
             <p role="alert">
-              Test failed{outcome.code ? ` (${outcome.code})` : ""}:{" "}
-              {outcome.message}
+              {t("registry.testFailedBanner", {
+                code: outcome.code ? ` (${outcome.code})` : "",
+                message: outcome.message,
+              })}
             </p>
           )}
         </div>
@@ -579,6 +613,7 @@ function ProviderEditor({
   onCredentialStage: (credentialId: string, secret: string) => void;
   stagedCredential: string | undefined;
 }) {
+  const t = useTranslations("modelConfig");
   const spec = adapterSpecFor(data.adapter_specs, provider.adapter);
   const authModes = supportedAuthModes(spec);
   const credentialStatus = credentialStatusFor(data, provider.auth.credential_id);
@@ -603,14 +638,14 @@ function ProviderEditor({
               onChange({ ...provider, enabled: event.target.checked })
             }
           />
-          enabled
+          {t("registry.enabled")}
         </label>
         <Button type="button" variant="outline" size="sm" onClick={onRemove}>
-          Remove provider
+          {t("registry.removeProvider")}
         </Button>
       </div>
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Provider id">
+        <Field label={t("registry.providerId")}>
           <input
             type="text"
             className={inputClass}
@@ -619,7 +654,7 @@ function ProviderEditor({
             onChange={(event) => onChange({ ...provider, id: event.target.value })}
           />
         </Field>
-        <Field label="Display name">
+        <Field label={t("registry.displayName")}>
           <input
             type="text"
             className={inputClass}
@@ -627,7 +662,7 @@ function ProviderEditor({
             onChange={(event) => onChange({ ...provider, name: event.target.value })}
           />
         </Field>
-        <Field label="Adapter">
+        <Field label={t("registry.adapter")}>
           <select
             className={inputClass}
             value={provider.adapter}
@@ -662,8 +697,8 @@ function ProviderEditor({
         </Field>
       </div>
       <Field
-        label="Base URL"
-        hint="Any public HTTPS endpoint, or one of the configured development endpoints."
+        label={t("registry.baseUrl")}
+        hint={t("registry.baseUrlHint")}
       >
         <input
           type="text"
@@ -684,7 +719,7 @@ function ProviderEditor({
         </datalist>
       </Field>
       <div className="grid grid-cols-2 gap-2 sm:grid-cols-3">
-        <Field label="Auth mode">
+        <Field label={t("registry.authMode")}>
           <select
             className={inputClass}
             value={provider.auth.mode}
@@ -713,13 +748,17 @@ function ProviderEditor({
         </Field>
         {provider.auth.mode !== "none" && (
           <Field
-            label="API Key"
+            label={t("registry.apiKey")}
             hint={
               stagedCredential
-                ? "staged — will be saved with the registry"
+                ? t("registry.apiKeyStaged")
                 : credentialStatus?.configured
-                  ? `configured${credentialStatus.hint ? ` (${credentialStatus.hint})` : ""} — leave blank to keep`
-                  : "paste your API key"
+                  ? credentialStatus.hint
+                    ? t("registry.apiKeyConfiguredWithHint", {
+                        hint: credentialStatus.hint,
+                      })
+                    : t("registry.apiKeyConfigured")
+                  : t("registry.apiKeyPaste")
             }
           >
             <div className="relative">
@@ -730,7 +769,7 @@ function ProviderEditor({
                 autoComplete="new-password"
                 placeholder={
                   credentialStatus?.configured
-                    ? (credentialStatus.hint ?? "configured")
+                    ? (credentialStatus.hint ?? t("registry.configuredPlaceholder"))
                     : "sk-..."
                 }
                 onChange={(event) => {
@@ -747,7 +786,11 @@ function ProviderEditor({
               />
               <button
                 type="button"
-                aria-label={showSecret ? "Hide API key" : "Show API key"}
+                aria-label={
+                  showSecret
+                    ? t("registry.hideApiKey")
+                    : t("registry.showApiKey")
+                }
                 className="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
                 onClick={() => setShowSecret((current) => !current)}
               >
@@ -769,37 +812,37 @@ function ProviderEditor({
           ) : (
             <ChevronRight className="size-3.5" aria-hidden="true" />
           )}
-          Advanced
+          {t("registry.advanced")}
         </button>
         {showAdvanced && (
       <div className="mt-2 grid grid-cols-2 gap-2 sm:grid-cols-3">
         <NumberField
-          label="Timeout (s)"
+          label={t("registry.timeoutSeconds")}
           value={provider.runtime.timeout_seconds}
           rule={spec?.parameters["timeout_seconds"] ?? null}
           onChange={(value) => setRuntime({ timeout_seconds: value ?? 120 })}
         />
         <NumberField
-          label="Max retries"
+          label={t("registry.maxRetries")}
           value={provider.runtime.max_retries}
           rule={spec?.parameters["max_retries"] ?? null}
           onChange={(value) => setRuntime({ max_retries: value ?? 0 })}
         />
         <NumberField
-          label="Default temperature"
+          label={t("registry.defaultTemperature")}
           value={provider.runtime.default_temperature}
           nullable
           rule={spec?.parameters["temperature"] ?? null}
           onChange={(value) => setRuntime({ default_temperature: value })}
         />
         <NumberField
-          label="Default top p"
+          label={t("registry.defaultTopP")}
           value={provider.runtime.default_top_p}
           nullable
           rule={spec?.parameters["top_p"] ?? null}
           onChange={(value) => setRuntime({ default_top_p: value })}
         />
-        <Field label="Default reasoning effort">
+        <Field label={t("registry.defaultReasoningEffort")}>
           <select
             className={inputClass}
             value={provider.runtime.default_reasoning_effort}
@@ -823,7 +866,9 @@ function ProviderEditor({
       </div>
       <div className="space-y-2">
         <div className="flex items-center justify-between">
-          <p className="text-xs font-medium text-muted-foreground">Models</p>
+          <p className="text-xs font-medium text-muted-foreground">
+            {t("registry.modelsHeading")}
+          </p>
           <Button
             type="button"
             variant="outline"
@@ -842,11 +887,11 @@ function ProviderEditor({
               });
             }}
           >
-            Add model
+            {t("registry.addModel")}
           </Button>
         </div>
         {provider.models.length === 0 && (
-          <p className="text-xs text-muted-foreground">No models yet.</p>
+          <p className="text-xs text-muted-foreground">{t("registry.noModels")}</p>
         )}
         {provider.models.map((model, modelIndex) => {
           const ref: ModelRef = { provider_id: provider.id, model_key: model.key };
@@ -888,6 +933,7 @@ function ProviderEditor({
  * The backend remains the only validation authority; the editor renders
  * controls from `adapter_specs` and surfaces 422 detail paths verbatim. */
 export function RegistryEditor() {
+  const t = useTranslations("modelConfig");
   const [data, setData] = useState<GetModelRegistryResponse | null>(null);
   const [draft, setDraft] = useState<RegistryV4 | null>(null);
   const [credentialWrites, setCredentialWrites] = useState<Map<string, string>>(
@@ -919,7 +965,9 @@ export function RegistryEditor() {
         return;
       }
       if (!response.ok) {
-        const error = await readApiError(response);
+        const error = await readApiError(response, (status) =>
+          t("registry.requestFailed", { status })
+        );
         throw new Error(error.message);
       }
       const body = (await response.json()) as GetModelRegistryResponse;
@@ -930,10 +978,10 @@ export function RegistryEditor() {
       setSaveIssues(null);
     } catch (reason) {
       setLoadError(
-        reason instanceof Error ? reason.message : "Failed to load the registry."
+        reason instanceof Error ? reason.message : t("registry.loadFailed")
       );
     }
-  }, []);
+  }, [t]);
 
   useEffect(() => {
     void load();
@@ -992,14 +1040,17 @@ export function RegistryEditor() {
     setSaveIssues(null);
     try {
       const writes = stagedWrites();
-      const result = await putRegistry({
-        expected_revision: data.revision,
-        registry: draft,
-        ...(writes.length > 0 ? { credential_writes: writes } : {}),
-      });
+      const result = await putRegistry(
+        {
+          expected_revision: data.revision,
+          registry: draft,
+          ...(writes.length > 0 ? { credential_writes: writes } : {}),
+        },
+        (status) => t("registry.requestFailed", { status })
+      );
       if (!result.ok) {
         if (result.status === 409) {
-          toast.error("Registry changed elsewhere — reloaded the latest state.");
+          toast.error(t("registry.changedElsewhere"));
           await load();
           return;
         }
@@ -1012,16 +1063,18 @@ export function RegistryEditor() {
       setCredentialWrites(new Map());
       setTestOutcomes({});
       invalidateAvailableModels();
-      toast.success(`Registry saved (revision ${result.body.revision}).`);
+      toast.success(
+        t("registry.saved", { revision: result.body.revision })
+      );
     } catch (reason) {
       errorToast(
         "models.registry",
-        reason instanceof Error ? reason.message : "Failed to save the registry."
+        reason instanceof Error ? reason.message : t("registry.saveFailed")
       );
     } finally {
       setSaving(false);
     }
-  }, [data, draft, stagedWrites, load]);
+  }, [data, draft, stagedWrites, load, t]);
 
   /** Save with unverifiable models disabled (design doc 9.2 rule 5): the
    * backend only stores an enabled model alongside a passing verification,
@@ -1049,24 +1102,24 @@ export function RegistryEditor() {
           if (!replacement) {
             errorToast(
               "models.registry",
-              "Editing the default primary model requires a second enabled model to take over."
+              t("registry.primaryNeedsSecondModel")
             );
             return;
           }
           next.defaults.primary = replacement;
         }
         const writes = stagedWrites();
-        const result = await putRegistry({
-          expected_revision: data.revision,
-          registry: next,
-          ...(writes.length > 0 ? { credential_writes: writes } : {}),
-        });
+        const result = await putRegistry(
+          {
+            expected_revision: data.revision,
+            registry: next,
+            ...(writes.length > 0 ? { credential_writes: writes } : {}),
+          },
+          (status) => t("registry.requestFailed", { status })
+        );
         if (!result.ok) {
           if (result.status === 409) {
-            errorToast(
-              "models.registry",
-              "Registry changed elsewhere — reloaded the latest state."
-            );
+            errorToast("models.registry", t("registry.changedElsewhere"));
             await load();
             return;
           }
@@ -1079,18 +1132,18 @@ export function RegistryEditor() {
         setCredentialWrites(new Map());
         invalidateAvailableModels();
         toast.success(
-          `Registry saved (revision ${result.body.revision}); changed models are disabled — test and re-enable them when ready.`
+          t("registry.savedDisabled", { revision: result.body.revision })
         );
       } catch (reason) {
         errorToast(
           "models.registry",
-          reason instanceof Error ? reason.message : "Failed to save the registry."
+          reason instanceof Error ? reason.message : t("registry.saveFailed")
         );
       } finally {
         setSaving(false);
       }
     },
-    [data, draft, stagedWrites, load]
+    [data, draft, stagedWrites, load, t]
   );
 
   const testModel = useCallback(
@@ -1108,7 +1161,9 @@ export function RegistryEditor() {
           }),
         });
         if (!response.ok) {
-          const error = await readApiError(response);
+          const error = await readApiError(response, (status) =>
+            t("registry.requestFailed", { status })
+          );
           setTestOutcomes((current) => ({
             ...current,
             [key]: { ok: false, message: error.message, code: error.code },
@@ -1141,20 +1196,20 @@ export function RegistryEditor() {
                 }
               : current
           );
-          toast.success(`${key} passed the provider test.`);
+          toast.success(t("registry.testPassedToast", { key }));
           invalidateAvailableModels();
         } else {
           setTestOutcomes((current) => ({
             ...current,
             [key]: {
               ok: false,
-              message: "The provider rejected the test request.",
+              message: t("registry.providerRejectedTest"),
               code: null,
             },
           }));
           errorToast(
             "models.provider-test",
-            `${key} failed the provider test.`
+            t("registry.testFailedToast", { key })
           );
         }
       } catch (reason) {
@@ -1163,7 +1218,9 @@ export function RegistryEditor() {
           [key]: {
             ok: false,
             message:
-              reason instanceof Error ? reason.message : "Provider test failed.",
+              reason instanceof Error
+                ? reason.message
+                : t("registry.testFailedGeneric"),
             code: null,
           },
         }));
@@ -1171,13 +1228,13 @@ export function RegistryEditor() {
         setTesting((current) => ({ ...current, [key]: false }));
       }
     },
-    [data, load]
+    [data, load, t]
   );
 
   if (forbidden) {
     return (
       <p className="rounded-md border border-border px-4 py-3 text-sm text-muted-foreground">
-        Model configuration requires an admin account.
+        {t("registry.forbidden")}
       </p>
     );
   }
@@ -1186,13 +1243,15 @@ export function RegistryEditor() {
       <div className="space-y-2 rounded-md border border-destructive/30 bg-destructive/5 px-4 py-3 text-sm">
         <p role="alert">{loadError}</p>
         <Button type="button" variant="outline" size="sm" onClick={() => void load()}>
-          Retry
+          {t("registry.retry")}
         </Button>
       </div>
     );
   }
   if (!data || !draft) {
-    return <p className="text-sm text-muted-foreground">Loading registry…</p>;
+    return (
+      <p className="text-sm text-muted-foreground">{t("registry.loading")}</p>
+    );
   }
 
   const defaultOptions = enabledModelRefs(draft);
@@ -1213,20 +1272,20 @@ export function RegistryEditor() {
     <div className="space-y-4">
       <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
         <span className="rounded bg-accent px-1.5 py-0.5">
-          state: {draft.state}
+          {t("registry.stateBadge", { state: draft.state })}
         </span>
         <span className="rounded bg-accent px-1.5 py-0.5">
-          revision: {data.revision}
+          {t("registry.revisionBadge", { revision: data.revision })}
         </span>
         {dirty && (
           <span className="rounded bg-[var(--color-warning)]/10 px-1.5 py-0.5 text-[var(--color-warning)]">
-            unsaved changes
+            {t("registry.unsavedChanges")}
           </span>
         )}
       </div>
 
       <div className="grid grid-cols-1 gap-2 rounded-lg border border-border p-4 sm:grid-cols-2">
-        <Field label="Default primary model">
+        <Field label={t("registry.defaultPrimaryModel")}>
           <select
             className={inputClass}
             value={
@@ -1242,7 +1301,7 @@ export function RegistryEditor() {
               })
             }
           >
-            <option value="">— none —</option>
+            <option value="">{t("registry.noneOption")}</option>
             {defaultOptions.map((option) => (
               <option key={modelRefKey(option.ref)} value={modelRefKey(option.ref)}>
                 {option.label}
@@ -1254,10 +1313,14 @@ export function RegistryEditor() {
 
       <div className="grid grid-cols-1 gap-4 sm:grid-cols-[14rem_1fr]">
         <div className="space-y-3">
-          <div className="space-y-1" role="listbox" aria-label="Providers">
+          <div
+            className="space-y-1"
+            role="listbox"
+            aria-label={t("registry.providers")}
+          >
             {draft.providers.length === 0 && (
               <p className="text-xs text-muted-foreground">
-                No providers yet. Add one from a template below.
+                {t("registry.noProviders")}
               </p>
             )}
             {draft.providers.map((provider, index) => {
@@ -1280,7 +1343,11 @@ export function RegistryEditor() {
                       className={`inline-block size-2 shrink-0 rounded-full ${
                         provider.enabled ? "bg-emerald-600" : "bg-muted-foreground/40"
                       }`}
-                      title={provider.enabled ? "provider enabled" : "provider disabled"}
+                      title={
+                        provider.enabled
+                          ? t("registry.providerEnabled")
+                          : t("registry.providerDisabled")
+                      }
                     />
                     <span className="truncate font-medium">
                       {provider.name || provider.id}
@@ -1307,14 +1374,14 @@ export function RegistryEditor() {
               className={inputClass}
               value={selectedTemplate}
               onChange={(event) => setSelectedTemplate(event.target.value)}
-              aria-label="Provider template"
+              aria-label={t("registry.providerTemplate")}
             >
               {PROVIDER_TEMPLATES.map((template) => (
                 <option key={template.id} value={template.id}>
                   {template.label}
                 </option>
               ))}
-              <option value="blank">Blank provider</option>
+              <option value="blank">{t("registry.blankProvider")}</option>
             </select>
             <Button
               type="button"
@@ -1339,11 +1406,10 @@ export function RegistryEditor() {
                 setSelectedProviderIndex(draft.providers.length);
               }}
             >
-              Add provider
+              {t("registry.addProvider")}
             </Button>
             <p className="text-[11px] text-muted-foreground">
-              Templates only prefill the adapter, Base URL, and suggested
-              models; a saved provider is an ordinary profile.
+              {t("registry.templatesFootnote")}
             </p>
           </div>
         </div>
@@ -1351,7 +1417,7 @@ export function RegistryEditor() {
         <div>
           {selectedProvider === null ? (
             <p className="rounded-lg border border-dashed border-border px-4 py-8 text-center text-sm text-muted-foreground">
-              Select a provider on the left, or add one from a template.
+              {t("registry.selectProvider")}
             </p>
           ) : (
             <ProviderEditor
@@ -1406,7 +1472,9 @@ export function RegistryEditor() {
           <ul className="mt-1 list-inside list-disc">
             {saveIssues.details.map((detail, index) => (
               <li key={index}>
-                <span className="font-mono">{detail.path ?? "(request)"}</span>
+                <span className="font-mono">
+                  {detail.path ?? t("registry.requestPath")}
+                </span>
                 {detail.code ? ` — ${detail.code}` : ""}
               </li>
             ))}
@@ -1417,19 +1485,18 @@ export function RegistryEditor() {
       {reverifyRefs.length > 0 && (
         <div className="rounded-md border border-[var(--color-warning)]/30 bg-[var(--color-warning)]/5 px-4 py-3 text-xs">
           <p className="font-medium">
-            Changed models will be saved as disabled:{" "}
-            {reverifyRefs.map(modelRefKey).join(", ")}
+            {t("registry.changedModelsDisabled", {
+              keys: reverifyRefs.map(modelRefKey).join(", "),
+            })}
           </p>
           <p className="mt-1 text-muted-foreground">
-            An enabled model needs a passing provider test at its current
-            configuration. Saving disables the changed models
-            {repointTarget
-              ? ` and points the default primary at ${modelRefKey(
-                  repointTarget
-                )}`
-              : ""}
-            ; use each model&apos;s Test button when ready, then re-enable and
-            save again.
+            {t("registry.changedModelsExplanation", {
+              repoint: repointTarget
+                ? t("registry.repointPrimary", {
+                    target: modelRefKey(repointTarget),
+                  })
+                : "",
+            })}
           </p>
         </div>
       )}
@@ -1445,10 +1512,10 @@ export function RegistryEditor() {
           disabled={saving || !dirty}
         >
           {saving
-            ? "Saving…"
+            ? t("registry.saving")
             : reverifyRefs.length > 0
-            ? "Save (changed models disabled)"
-            : "Save registry"}
+            ? t("registry.saveWithDisabled")
+            : t("registry.saveRegistry")}
         </Button>
         <Button
           type="button"
@@ -1460,14 +1527,14 @@ export function RegistryEditor() {
             setSaveIssues(null);
           }}
         >
-          Discard changes
+          {t("registry.discardChanges")}
         </Button>
       </div>
       <p className="text-[11px] text-muted-foreground">
-        IDs use lowercase letters, digits, dot, underscore and dash
-        (e.g. <span className="font-mono">zhipu-glm/glm-5.2</span>):{" "}
-        {ID_PATTERN.source}. Enabling a model requires confirmed limits and a
-        passing provider test at the current configuration.
+        {t.rich("registry.idFootnote", {
+          pattern: ID_PATTERN.source,
+          mono: (chunks) => <span className="font-mono">{chunks}</span>,
+        })}
       </p>
     </div>
   );
diff --git a/src/app/components/system-config/BackupTab.tsx b/src/app/components/system-config/BackupTab.tsx
index f5470c2..309981f 100644
--- a/src/app/components/system-config/BackupTab.tsx
+++ b/src/app/components/system-config/BackupTab.tsx
@@ -2,6 +2,7 @@
 
 import useSWR from "swr";
 import { useState } from "react";
+import { useTranslations } from "next-intl";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -15,12 +16,6 @@ interface BackupEntry {
   origin: "manual" | "auto";
 }
 
-const fetcher = async (url: string): Promise<{ backups: BackupEntry[] }> => {
-  const response = await fetch(url, { cache: "no-store" });
-  if (!response.ok) throw new Error(`Backup request failed (${response.status}).`);
-  return (await response.json()) as { backups: BackupEntry[] };
-};
-
 function formatSize(size: number): string {
   if (size < 1024 * 1024) return `${(size / 1024).toFixed(1)} KB`;
   if (size < 1024 * 1024 * 1024) return `${(size / 1024 / 1024).toFixed(1)} MB`;
@@ -28,6 +23,16 @@ function formatSize(size: number): string {
 }
 
 export function BackupTab({ draft, setDraft }: TabProps) {
+  const t = useTranslations("systemConfig");
+
+  const fetcher = async (url: string): Promise<{ backups: BackupEntry[] }> => {
+    const response = await fetch(url, { cache: "no-store" });
+    if (!response.ok) {
+      throw new Error(t("backup.requestFailed", { status: response.status }));
+    }
+    return (await response.json()) as { backups: BackupEntry[] };
+  };
+
   const { data, mutate } = useSWR("/api/system/backup", fetcher, {
     revalidateOnFocus: false,
   });
@@ -40,22 +45,28 @@ export function BackupTab({ draft, setDraft }: TabProps) {
       const body = (await response.json().catch(() => null)) as
         | { message?: string }
         | null;
-      if (!response.ok) throw new Error(body?.message || "Backup failed.");
+      if (!response.ok) throw new Error(body?.message || t("backup.backupFailed"));
       void mutate();
     } catch (error) {
-      errorToast("backup.run", error instanceof Error ? error.message : "Backup failed.");
+      errorToast(
+        "backup.run",
+        error instanceof Error ? error.message : t("backup.backupFailed")
+      );
     } finally {
       setRunning(false);
     }
   };
 
   const remove = async (name: string) => {
-    if (!window.confirm(`Delete ${name}?`)) return;
+    if (!window.confirm(t("backup.confirmDelete", { name }))) return;
     const response = await fetch(`/api/system/backup/${encodeURIComponent(name)}`, {
       method: "DELETE",
     });
     if (!response.ok) {
-      errorToast("backup.delete", `Delete failed (${response.status}).`);
+      errorToast(
+        "backup.delete",
+        t("backup.deleteFailed", { status: response.status })
+      );
       return;
     }
     void mutate();
@@ -70,11 +81,11 @@ export function BackupTab({ draft, setDraft }: TabProps) {
   return (
     <div className="space-y-5">
       <div className="space-y-1.5">
-        <Label htmlFor="backend-dir">Backend data directory</Label>
+        <Label htmlFor="backend-dir">{t("backup.backendDir")}</Label>
         <Input
           id="backend-dir"
           value={draft.backup.backendDataDir}
-          placeholder="e.g. /srv/evoscientist/data (optional)"
+          placeholder={t("backup.backendDirPlaceholder")}
           onChange={(event) =>
             setDraft((config) => ({
               ...config,
@@ -91,10 +102,10 @@ export function BackupTab({ draft, setDraft }: TabProps) {
             checked={draft.backup.schedule.enabled}
             onChange={(event) => setSchedule({ enabled: event.target.checked })}
           />
-          Scheduled backups
+          {t("backup.scheduled")}
         </label>
         <label className="flex items-center gap-2 text-sm">
-          every
+          {t("backup.every")}
           <input
             type="number"
             min={1}
@@ -108,10 +119,10 @@ export function BackupTab({ draft, setDraft }: TabProps) {
               }
             }}
           />
-          hours
+          {t("backup.hours")}
         </label>
         <label className="flex items-center gap-2 text-sm">
-          keep
+          {t("backup.keep")}
           <input
             type="number"
             min={1}
@@ -128,15 +139,15 @@ export function BackupTab({ draft, setDraft }: TabProps) {
         </label>
       </div>
       <div className="flex items-center justify-between">
-        <Label>Backup history</Label>
+        <Label>{t("backup.history")}</Label>
         <Button size="sm" onClick={() => void runNow()} disabled={running}>
-          {running ? "Backing up…" : "Back up now"}
+          {running ? t("backup.running") : t("backup.runNow")}
         </Button>
       </div>
       <div className="max-h-44 overflow-y-auto rounded-md border border-border">
         {!data || data.backups.length === 0 ? (
           <p className="px-3 py-4 text-center text-xs text-muted-foreground">
-            No backups yet.
+            {t("backup.empty")}
           </p>
         ) : (
           <table className="w-full text-xs">
@@ -151,14 +162,14 @@ export function BackupTab({ draft, setDraft }: TabProps) {
                       href={`/api/system/backup/${encodeURIComponent(entry.name)}`}
                       className="text-[var(--brand)] hover:underline"
                     >
-                      Download
+                      {t("backup.download")}
                     </a>
                     <button
                       type="button"
                       className="ml-2 text-destructive hover:underline"
                       onClick={() => void remove(entry.name)}
                     >
-                      Delete
+                      {t("backup.delete")}
                     </button>
                   </td>
                 </tr>
diff --git a/src/app/components/system-config/GeneralTab.tsx b/src/app/components/system-config/GeneralTab.tsx
index 2ab9375..eaeac1c 100644
--- a/src/app/components/system-config/GeneralTab.tsx
+++ b/src/app/components/system-config/GeneralTab.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useRef, useState } from "react";
+import { useTranslations } from "next-intl";
 import { mutate as globalMutate } from "swr";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -27,6 +28,7 @@ function BrandingUpload({
   const inputRef = useRef<HTMLInputElement>(null);
   const [preview, setPreview] = useState<string | null>(null);
   const [busy, setBusy] = useState(false);
+  const t = useTranslations("systemConfig");
   const fileField = kind === "logo" ? "logoFile" : "faviconFile";
 
   const call = async (url: string, init: RequestInit, fallback: string) => {
@@ -60,14 +62,18 @@ function BrandingUpload({
     const form = new FormData();
     form.set("kind", kind);
     form.set("file", file);
-    void call("/api/system/branding", { method: "POST", body: form }, "Upload failed.");
+    void call(
+      "/api/system/branding",
+      { method: "POST", body: form },
+      t("general.uploadFailed")
+    );
   };
 
   return (
     <div className="flex items-center gap-3">
       <img
         src={preview ?? currentSrc}
-        alt={`${label} preview`}
+        alt={t("general.previewAlt", { label })}
         className={kind === "logo" ? "size-8 shrink-0" : "size-5 shrink-0"}
       />
       <div className="flex-1 space-y-1">
@@ -89,17 +95,21 @@ function BrandingUpload({
         disabled={busy || !preview}
         onClick={upload}
       >
-        Upload
+        {t("general.upload")}
       </Button>
       <Button
         variant="ghost"
         size="sm"
         disabled={busy}
         onClick={() =>
-          void call(`/api/system/branding?kind=${kind}`, { method: "DELETE" }, "Restore failed.")
+          void call(
+            `/api/system/branding?kind=${kind}`,
+            { method: "DELETE" },
+            t("general.restoreFailed")
+          )
         }
       >
-        Restore default
+        {t("general.restoreDefault")}
       </Button>
     </div>
   );
@@ -107,10 +117,11 @@ function BrandingUpload({
 
 export function GeneralTab({ draft, setDraft }: TabProps) {
   const publicConfig = usePublicSystemConfig();
+  const t = useTranslations("systemConfig");
   return (
     <div className="space-y-5">
       <div className="space-y-1.5">
-        <Label htmlFor="wordmark">Wordmark (top-left &amp; login page)</Label>
+        <Label htmlFor="wordmark">{t("general.wordmark")}</Label>
         <Input
           id="wordmark"
           value={draft.branding.wordmark}
@@ -123,10 +134,10 @@ export function GeneralTab({ draft, setDraft }: TabProps) {
           }
         />
       </div>
-      <BrandingUpload kind="logo" label="Logo" currentSrc={logoSrc(publicConfig)} setDraft={setDraft} />
+      <BrandingUpload kind="logo" label={t("general.logo")} currentSrc={logoSrc(publicConfig)} setDraft={setDraft} />
       <BrandingUpload
         kind="favicon"
-        label="Favicon"
+        label={t("general.favicon")}
         currentSrc={
           publicConfig && publicConfig.faviconVersion > 0
             ? `/api/system/branding/asset/favicon?v=${publicConfig.faviconVersion}`
@@ -134,10 +145,7 @@ export function GeneralTab({ draft, setDraft }: TabProps) {
         }
         setDraft={setDraft}
       />
-      <p className="text-xs text-muted-foreground">
-        PNG, JPEG or SVG, up to 512KB. The favicon also accepts ICO. Changes
-        apply on save for the wordmark; uploads apply immediately.
-      </p>
+      <p className="text-xs text-muted-foreground">{t("general.hint")}</p>
     </div>
   );
 }
diff --git a/src/app/components/system-config/LoginTermsTab.tsx b/src/app/components/system-config/LoginTermsTab.tsx
index 4ab3682..01a9a37 100644
--- a/src/app/components/system-config/LoginTermsTab.tsx
+++ b/src/app/components/system-config/LoginTermsTab.tsx
@@ -1,10 +1,12 @@
 "use client";
 
+import { useTranslations } from "next-intl";
 import { Label } from "@/components/ui/label";
 import { MarkdownContent } from "@/app/components/MarkdownContent";
 import type { TabProps } from "./SystemConfigDialog";
 
 export function LoginTermsTab({ draft, setDraft }: TabProps) {
+  const t = useTranslations("systemConfig");
   return (
     <div className="space-y-4">
       <label className="flex items-center gap-2 text-sm">
@@ -19,16 +21,16 @@ export function LoginTermsTab({ draft, setDraft }: TabProps) {
             }))
           }
         />
-        Show terms text on the login page (display only)
+        {t("loginTerms.showTerms")}
       </label>
       <div className="space-y-1.5">
-        <Label htmlFor="login-terms">Terms text (Markdown)</Label>
+        <Label htmlFor="login-terms">{t("loginTerms.termsLabel")}</Label>
         <textarea
           id="login-terms"
           value={draft.loginTerms.markdown}
           rows={6}
           maxLength={20000}
-          placeholder="e.g. By signing in you agree to the acceptable use policy…"
+          placeholder={t("loginTerms.placeholder")}
           className="w-full rounded-md border border-border bg-background px-3 py-2 text-sm focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring/20 focus-visible:border-[var(--brand)]"
           onChange={(event) =>
             setDraft((config) => ({
@@ -40,7 +42,7 @@ export function LoginTermsTab({ draft, setDraft }: TabProps) {
       </div>
       {draft.loginTerms.enabled && draft.loginTerms.markdown.trim() && (
         <div className="space-y-1.5">
-          <Label>Preview</Label>
+          <Label>{t("loginTerms.preview")}</Label>
           <div className="max-h-48 overflow-y-auto rounded-md border border-border bg-muted/40 p-3 text-sm">
             <MarkdownContent content={draft.loginTerms.markdown} />
           </div>
diff --git a/src/app/components/system-config/SecurityTab.tsx b/src/app/components/system-config/SecurityTab.tsx
index 4994d8e..4513e6b 100644
--- a/src/app/components/system-config/SecurityTab.tsx
+++ b/src/app/components/system-config/SecurityTab.tsx
@@ -1,5 +1,6 @@
 "use client";
 
+import { useTranslations } from "next-intl";
 import { Label } from "@/components/ui/label";
 import type { TabProps } from "./SystemConfigDialog";
 
@@ -16,6 +17,7 @@ function TriState({
   confirmOff?: string;
   confirmOn?: string;
 }) {
+  const t = useTranslations("systemConfig");
   return (
     <div className="flex items-center justify-between gap-3">
       <Label className="text-sm font-normal">{label}</Label>
@@ -30,9 +32,9 @@ function TriState({
           onChange(next);
         }}
       >
-        <option value="default">Default (env)</option>
-        <option value="on">On</option>
-        <option value="off">Off</option>
+        <option value="default">{t("security.options.default")}</option>
+        <option value="on">{t("security.options.on")}</option>
+        <option value="off">{t("security.options.off")}</option>
       </select>
     </div>
   );
@@ -79,6 +81,7 @@ function NullableNumber({
 }
 
 export function SecurityTab({ draft, setDraft }: TabProps) {
+  const t = useTranslations("systemConfig");
   const set = (patch: Partial<TabProps["draft"]["security"]>) =>
     setDraft((config) => ({
       ...config,
@@ -87,14 +90,14 @@ export function SecurityTab({ draft, setDraft }: TabProps) {
   return (
     <div className="space-y-4">
       <TriState
-        label="WebUI authentication"
+        label={t("security.authEnabled")}
         value={draft.security.authEnabled}
-        confirmOff="Disabling authentication opens the UI to anyone who can reach it. Continue?"
-        confirmOn="Enabling authentication requires WEBUI_AUTH_SECRET to be set in the server environment. Without it, every page (including this dialog) will return 503 and recovery requires hand-editing ~/.evoscientist/system-config.json. Continue?"
+        confirmOff={t("security.confirmAuthOff")}
+        confirmOn={t("security.confirmAuthOn")}
         onChange={(authEnabled) => set({ authEnabled })}
       />
       <NullableNumber
-        label="Session lifetime (hours)"
+        label={t("security.sessionTtl")}
         value={draft.security.sessionTtlHours}
         min={1}
         max={720}
@@ -102,7 +105,7 @@ export function SecurityTab({ draft, setDraft }: TabProps) {
         onChange={(sessionTtlHours) => set({ sessionTtlHours })}
       />
       <NullableNumber
-        label="Password minimum length"
+        label={t("security.passwordMinLength")}
         value={draft.security.passwordMinLength}
         min={6}
         max={64}
@@ -110,22 +113,19 @@ export function SecurityTab({ draft, setDraft }: TabProps) {
         onChange={(passwordMinLength) => set({ passwordMinLength })}
       />
       <TriState
-        label="Login captcha"
+        label={t("security.captchaEnabled")}
         value={draft.security.captchaEnabled}
         onChange={(captchaEnabled) => set({ captchaEnabled })}
       />
       <NullableNumber
-        label="Captcha after N failed logins"
+        label={t("security.captchaThreshold")}
         value={draft.security.captchaThreshold}
         min={1}
         max={10}
         hint="3"
         onChange={(captchaThreshold) => set({ captchaThreshold })}
       />
-      <p className="text-xs text-muted-foreground">
-        Empty fields keep the environment defaults. Session lifetime applies to
-        newly issued sessions; existing sessions keep their fixed expiry.
-      </p>
+      <p className="text-xs text-muted-foreground">{t("security.footnote")}</p>
     </div>
   );
 }
diff --git a/src/app/components/system-config/SystemConfigDialog.tsx b/src/app/components/system-config/SystemConfigDialog.tsx
index c418d90..082108d 100644
--- a/src/app/components/system-config/SystemConfigDialog.tsx
+++ b/src/app/components/system-config/SystemConfigDialog.tsx
@@ -1,6 +1,7 @@
 "use client";
 
 import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
 import useSWR, { mutate as globalMutate } from "swr";
 import {
   Dialog,
@@ -42,19 +43,8 @@ export interface TabProps {
 
 const CONFIG_KEY = "/api/system/config";
 
-const fetcher = async (url: string): Promise<SystemConfig> => {
-  const response = await fetch(url, { cache: "no-store" });
-  if (!response.ok) throw new Error(`Config request failed (${response.status}).`);
-  return (await response.json()) as SystemConfig;
-};
-
 type TabId = "general" | "terms" | "security" | "backup";
-const TABS: Array<{ id: TabId; label: string }> = [
-  { id: "general", label: "General" },
-  { id: "terms", label: "Login terms" },
-  { id: "security", label: "Security" },
-  { id: "backup", label: "Data backup" },
-];
+const TABS: TabId[] = ["general", "terms", "security", "backup"];
 
 export function SystemConfigDialog({
   open,
@@ -63,6 +53,16 @@ export function SystemConfigDialog({
   open: boolean;
   onOpenChange: (open: boolean) => void;
 }) {
+  const t = useTranslations("systemConfig");
+
+  const fetcher = async (url: string): Promise<SystemConfig> => {
+    const response = await fetch(url, { cache: "no-store" });
+    if (!response.ok) {
+      throw new Error(t("requestFailed", { status: response.status }));
+    }
+    return (await response.json()) as SystemConfig;
+  };
+
   const { data, mutate } = useSWR<SystemConfig>(open ? CONFIG_KEY : null, fetcher, {
     revalidateOnFocus: false,
   });
@@ -80,7 +80,7 @@ export function SystemConfigDialog({
   const dirty = Boolean(draft && data && JSON.stringify(draft) !== JSON.stringify(data));
 
   const close = (next: boolean) => {
-    if (!next && dirty && !window.confirm("Discard unsaved changes?")) return;
+    if (!next && dirty && !window.confirm(t("discardConfirm"))) return;
     onOpenChange(next);
   };
 
@@ -102,11 +102,16 @@ export function SystemConfigDialog({
         | { message?: string }
         | null;
       if (!response.ok) {
-        throw new Error(body?.message || `Save failed (${response.status}).`);
+        throw new Error(
+          body?.message || t("saveFailedStatus", { status: response.status })
+        );
       }
       onSaved();
     } catch (error) {
-      errorToast("system-config.save", error instanceof Error ? error.message : "Save failed.");
+      errorToast(
+        "system-config.save",
+        error instanceof Error ? error.message : t("saveFailed")
+      );
     } finally {
       setSaving(false);
     }
@@ -116,14 +121,11 @@ export function SystemConfigDialog({
     <Dialog open={open} onOpenChange={close}>
       <DialogContent className="sm:max-w-2xl">
         <DialogHeader>
-          <DialogTitle>System config</DialogTitle>
-          <DialogDescription>
-            System-wide parameters. Admin only; unset fields fall back to
-            environment defaults.
-          </DialogDescription>
+          <DialogTitle>{t("title")}</DialogTitle>
+          <DialogDescription>{t("description")}</DialogDescription>
         </DialogHeader>
         <div className="flex gap-1 border-b border-border">
-          {TABS.map(({ id, label }) => (
+          {TABS.map((id) => (
             <button
               key={id}
               type="button"
@@ -134,13 +136,15 @@ export function SystemConfigDialog({
                   : "border-transparent text-muted-foreground hover:text-foreground"
               }`}
             >
-              {label}
+              {t(`tabs.${id}`)}
             </button>
           ))}
         </div>
         <div className="min-h-[280px] py-4">
           {!draft ? (
-            <p className="py-10 text-center text-sm text-muted-foreground">Loading…</p>
+            <p className="py-10 text-center text-sm text-muted-foreground">
+              {t("loading")}
+            </p>
           ) : (
             <>
               {tab === "general" && (
@@ -160,10 +164,10 @@ export function SystemConfigDialog({
         </div>
         <DialogFooter>
           <Button variant="outline" onClick={() => close(false)}>
-            Close
+            {t("close")}
           </Button>
           <Button onClick={() => void save()} disabled={!draft || !dirty || saving}>
-            {saving ? "Saving…" : "Save"}
+            {saving ? t("saving") : t("save")}
           </Button>
         </DialogFooter>
       </DialogContent>
diff --git a/src/i18n/messages/en/changePassword.ts b/src/i18n/messages/en/changePassword.ts
new file mode 100644
index 0000000..cf7ae01
--- /dev/null
+++ b/src/i18n/messages/en/changePassword.ts
@@ -0,0 +1,14 @@
+export default {
+  changePassword: {
+    title: "Change Password",
+    description:
+      "Changing the password signs out every existing session except this one.",
+    currentPassword: "Current password",
+    newPassword: "New password",
+    confirmPassword: "Confirm new password",
+    failed: "Unable to change the password.",
+    cancel: "Cancel",
+    submit: "Save Password",
+    saving: "Saving...",
+  },
+};
diff --git a/src/i18n/messages/en/dialogs.ts b/src/i18n/messages/en/dialogs.ts
index ca7ee4e..08d684f 100644
--- a/src/i18n/messages/en/dialogs.ts
+++ b/src/i18n/messages/en/dialogs.ts
@@ -1,3 +1,16 @@
 export default {
-  dialogs: {},
+  dialogs: {
+    account: {
+      title: "User information",
+      description: "Your signed-in account for this workspace.",
+      detailsLabel: "Account details",
+      username: "Username",
+      loading: "Loading account...",
+      unavailable: "Account information is unavailable.",
+      roles: {
+        admin: "Admin",
+        user: "User",
+      },
+    },
+  },
 };
diff --git a/src/i18n/messages/en/header.ts b/src/i18n/messages/en/header.ts
index 08a2be9..0310d3a 100644
--- a/src/i18n/messages/en/header.ts
+++ b/src/i18n/messages/en/header.ts
@@ -2,6 +2,7 @@ export default {
   header: {
     signOut: "Sign out",
     configuration: "Configuration",
+    account: "Account",
     userInformation: "User information",
     changePassword: "Change password",
     modelConfiguration: "Model configuration",
diff --git a/src/i18n/messages/en/imageModels.ts b/src/i18n/messages/en/imageModels.ts
new file mode 100644
index 0000000..8e1c0c2
--- /dev/null
+++ b/src/i18n/messages/en/imageModels.ts
@@ -0,0 +1,60 @@
+export default {
+  imageModels: {
+    title: "Image models",
+    description:
+      "Manage dedicated image-generation models (stored in config.yaml). Admin only.",
+    close: "Close",
+    loading: "Loading image models…",
+    loadFailed: "Failed to load image models.",
+    retry: "Retry",
+    forbidden: "Image model configuration requires an admin account.",
+    defaultModel: "Default model",
+    none: "— none —",
+    timeoutSeconds: "Timeout (s)",
+    modelsHeading: "Models",
+    addModel: "Add model",
+    empty: "No models yet.",
+    save: "Save",
+    saving: "Saving…",
+    discardChanges: "Discard changes",
+    unsavedChanges: "unsaved changes",
+    saved: "Image models saved.",
+    saveFailed: "Failed to save image models.",
+    fixParamsBeforeSaving: "Fix the invalid params JSON before saving.",
+    apiKeyWriteOnlyNote:
+      "API keys are write-only: leave the field blank to keep the stored key.",
+    card: {
+      newModel: "(new model)",
+      unnamed: "Image model",
+      enabled: "enabled",
+      test: "Test",
+      testing: "Testing…",
+      remove: "Remove",
+      fixParamsBeforeTesting: "Fix the invalid params JSON before testing.",
+      testPassed: "{id} passed the test in {seconds} s.",
+      testPassedBanner:
+        "Test passed in {seconds} s — the provider completed a real generation with these settings.",
+      testFailedToast: "{id} failed the test: {message}",
+      testFailedGeneric: "Test failed.",
+      testFailedBanner: "Test failed: {message}",
+      modelId: "Model id",
+      displayName: "Display name",
+      provider: "Provider",
+      baseUrl: "Base URL",
+      defaultSize: "Default size",
+      defaultQuality: "Default quality",
+      apiKey: "API Key",
+      apiKeyConfiguredNoHint: "configured — leave blank to keep",
+      apiKeyConfiguredWithHint: "configured ({hint}) — leave blank to keep",
+      apiKeyNotConfigured: "paste your API key",
+      showApiKey: "Show API key",
+      hideApiKey: "Hide API key",
+      paramsLabel: "Params (JSON object, optional)",
+      paramsErrorPrefix: "Params: {message}",
+      paramsErrors: {
+        notObject: "params must be a JSON object",
+        invalidJson: "invalid JSON",
+      },
+    },
+  },
+};
diff --git a/src/i18n/messages/en/index.ts b/src/i18n/messages/en/index.ts
index 42155e5..09a2504 100644
--- a/src/i18n/messages/en/index.ts
+++ b/src/i18n/messages/en/index.ts
@@ -7,6 +7,10 @@ import panels from "./panels";
 import login from "./login";
 import errors from "./errors";
 import userManagement from "./userManagement";
+import changePassword from "./changePassword";
+import modelConfig from "./modelConfig";
+import imageModels from "./imageModels";
+import systemConfig from "./systemConfig";
 
 export default {
   ...common,
@@ -18,4 +22,8 @@ export default {
   ...login,
   ...errors,
   ...userManagement,
+  ...changePassword,
+  ...modelConfig,
+  ...imageModels,
+  ...systemConfig,
 };
diff --git a/src/i18n/messages/en/modelConfig.ts b/src/i18n/messages/en/modelConfig.ts
new file mode 100644
index 0000000..9f7440b
--- /dev/null
+++ b/src/i18n/messages/en/modelConfig.ts
@@ -0,0 +1,118 @@
+export default {
+  modelConfig: {
+    title: "Model registry",
+    description:
+      "Manage providers, models, credentials and defaults. Admin only; every save is validated by the backend.",
+    collapseAgentActions: "Collapse agent actions by default",
+    close: "Close",
+    registry: {
+      requestFailed: "Request failed ({status}).",
+      minHint: "min {value}",
+      maxHint: "max {value}",
+      inheritPlaceholder: "inherit",
+      statusNew: "new",
+      toggleParameters: "Toggle parameters for {key}",
+      enabled: "enabled",
+      saveBeforeTesting:
+        "Save the registry before testing (tests only run against saved models).",
+      testing: "Testing…",
+      test: "Test",
+      remove: "Remove",
+      modelKey: "Model key",
+      displayName: "Display name",
+      upstreamModelId: "Upstream model id",
+      contextWindow: "Context window",
+      maxOutputTokens: "Max output tokens",
+      temperature: "Temperature",
+      temperatureUnsupported: "Temperature (unsupported)",
+      capabilities: "Capabilities",
+      capabilityTools: "tools",
+      capabilityVision: "vision",
+      capabilityStructuredOutput: "structured output",
+      advanced: "Advanced",
+      limitMode: "Limit mode",
+      maxInputTokens: "Max input tokens",
+      minEffectiveInput: "Min effective input",
+      systemReserve: "System reserve",
+      toolsReserve: "Tools reserve",
+      attachmentsReserve: "Attachments reserve",
+      limitsStatus: "Limits status",
+      limitsStatusNeedsConfirmation: "needs confirmation",
+      limitsStatusConfirmed: "confirmed",
+      limitsSource: "Limits source",
+      limitsSourceUser: "user",
+      limitsSourceProvider: "provider",
+      limitsSourceTestedContract: "tested contract",
+      topP: "Top p",
+      reasoningEffort: "Reasoning effort",
+      reasoningEffortUnsupported: "Reasoning effort (unsupported)",
+      testPassedBanner:
+        "Test passed in {latencyMs} ms — adapter spec revision {revision}, state {state}.",
+      testFailedBanner: "Test failed{code}: {message}",
+      removeProvider: "Remove provider",
+      providerId: "Provider id",
+      adapter: "Adapter",
+      baseUrl: "Base URL",
+      baseUrlHint:
+        "Any public HTTPS endpoint, or one of the configured development endpoints.",
+      authMode: "Auth mode",
+      apiKey: "API Key",
+      apiKeyStaged: "staged — will be saved with the registry",
+      apiKeyConfiguredWithHint: "configured ({hint}) — leave blank to keep",
+      apiKeyConfigured: "configured — leave blank to keep",
+      apiKeyPaste: "paste your API key",
+      configuredPlaceholder: "configured",
+      showApiKey: "Show API key",
+      hideApiKey: "Hide API key",
+      timeoutSeconds: "Timeout (s)",
+      maxRetries: "Max retries",
+      defaultTemperature: "Default temperature",
+      defaultTopP: "Default top p",
+      defaultReasoningEffort: "Default reasoning effort",
+      modelsHeading: "Models",
+      addModel: "Add model",
+      noModels: "No models yet.",
+      loadFailed: "Failed to load the registry.",
+      changedElsewhere: "Registry changed elsewhere — reloaded the latest state.",
+      saved: "Registry saved (revision {revision}).",
+      saveFailed: "Failed to save the registry.",
+      primaryNeedsSecondModel:
+        "Editing the default primary model requires a second enabled model to take over.",
+      savedDisabled:
+        "Registry saved (revision {revision}); changed models are disabled — test and re-enable them when ready.",
+      providerRejectedTest: "The provider rejected the test request.",
+      testPassedToast: "{key} passed the provider test.",
+      testFailedToast: "{key} failed the provider test.",
+      testFailedGeneric: "Provider test failed.",
+      forbidden: "Model configuration requires an admin account.",
+      retry: "Retry",
+      loading: "Loading registry…",
+      stateBadge: "state: {state}",
+      revisionBadge: "revision: {revision}",
+      unsavedChanges: "unsaved changes",
+      defaultPrimaryModel: "Default primary model",
+      noneOption: "— none —",
+      providers: "Providers",
+      noProviders: "No providers yet. Add one from a template below.",
+      providerEnabled: "provider enabled",
+      providerDisabled: "provider disabled",
+      providerTemplate: "Provider template",
+      blankProvider: "Blank provider",
+      addProvider: "Add provider",
+      templatesFootnote:
+        "Templates only prefill the adapter, Base URL, and suggested models; a saved provider is an ordinary profile.",
+      selectProvider: "Select a provider on the left, or add one from a template.",
+      requestPath: "(request)",
+      changedModelsDisabled: "Changed models will be saved as disabled: {keys}",
+      changedModelsExplanation:
+        "An enabled model needs a passing provider test at its current configuration. Saving disables the changed models{repoint}; use each model's Test button when ready, then re-enable and save again.",
+      repointPrimary: " and points the default primary at {target}",
+      saving: "Saving…",
+      saveWithDisabled: "Save (changed models disabled)",
+      saveRegistry: "Save registry",
+      discardChanges: "Discard changes",
+      idFootnote:
+        "IDs use lowercase letters, digits, dot, underscore and dash (e.g. <mono>zhipu-glm/glm-5.2</mono>): {pattern}. Enabling a model requires confirmed limits and a passing provider test at the current configuration.",
+    },
+  },
+};
diff --git a/src/i18n/messages/en/systemConfig.ts b/src/i18n/messages/en/systemConfig.ts
new file mode 100644
index 0000000..1c84747
--- /dev/null
+++ b/src/i18n/messages/en/systemConfig.ts
@@ -0,0 +1,75 @@
+export default {
+  systemConfig: {
+    title: "System config",
+    description:
+      "System-wide parameters. Admin only; unset fields fall back to environment defaults.",
+    loading: "Loading…",
+    close: "Close",
+    save: "Save",
+    saving: "Saving…",
+    discardConfirm: "Discard unsaved changes?",
+    saveFailed: "Save failed.",
+    saveFailedStatus: "Save failed ({status}).",
+    requestFailed: "Config request failed ({status}).",
+    tabs: {
+      general: "General",
+      terms: "Login terms",
+      security: "Security",
+      backup: "Data backup",
+    },
+    general: {
+      wordmark: "Wordmark (top-left & login page)",
+      logo: "Logo",
+      favicon: "Favicon",
+      hint: "PNG, JPEG or SVG, up to 512KB. The favicon also accepts ICO. Changes apply on save for the wordmark; uploads apply immediately.",
+      upload: "Upload",
+      restoreDefault: "Restore default",
+      uploadFailed: "Upload failed.",
+      restoreFailed: "Restore failed.",
+      previewAlt: "{label} preview",
+    },
+    security: {
+      authEnabled: "WebUI authentication",
+      sessionTtl: "Session lifetime (hours)",
+      passwordMinLength: "Password minimum length",
+      captchaEnabled: "Login captcha",
+      captchaThreshold: "Captcha after N failed logins",
+      options: {
+        default: "Default (env)",
+        on: "On",
+        off: "Off",
+      },
+      confirmAuthOff:
+        "Disabling authentication opens the UI to anyone who can reach it. Continue?",
+      confirmAuthOn:
+        "Enabling authentication requires WEBUI_AUTH_SECRET to be set in the server environment. Without it, every page (including this dialog) will return 503 and recovery requires hand-editing ~/.evoscientist/system-config.json. Continue?",
+      footnote:
+        "Empty fields keep the environment defaults. Session lifetime applies to newly issued sessions; existing sessions keep their fixed expiry.",
+    },
+    loginTerms: {
+      showTerms: "Show terms text on the login page (display only)",
+      termsLabel: "Terms text (Markdown)",
+      placeholder:
+        "e.g. By signing in you agree to the acceptable use policy…",
+      preview: "Preview",
+    },
+    backup: {
+      backendDir: "Backend data directory",
+      backendDirPlaceholder: "e.g. /srv/evoscientist/data (optional)",
+      scheduled: "Scheduled backups",
+      every: "every",
+      hours: "hours",
+      keep: "keep",
+      history: "Backup history",
+      runNow: "Back up now",
+      running: "Backing up…",
+      empty: "No backups yet.",
+      download: "Download",
+      delete: "Delete",
+      confirmDelete: "Delete {name}?",
+      backupFailed: "Backup failed.",
+      deleteFailed: "Delete failed ({status}).",
+      requestFailed: "Backup request failed ({status}).",
+    },
+  },
+};
diff --git a/src/i18n/messages/messages.test.ts b/src/i18n/messages/messages.test.ts
index 1c58af0..3ea3e5d 100644
--- a/src/i18n/messages/messages.test.ts
+++ b/src/i18n/messages/messages.test.ts
@@ -10,6 +10,10 @@ import enPanels from "./en/panels";
 import enLogin from "./en/login";
 import enErrors from "./en/errors";
 import enUserManagement from "./en/userManagement";
+import enChangePassword from "./en/changePassword";
+import enModelConfig from "./en/modelConfig";
+import enImageModels from "./en/imageModels";
+import enSystemConfig from "./en/systemConfig";
 
 vi.mock("server-only", () => ({}));
 
@@ -61,6 +65,10 @@ describe("message catalogs", () => {
       enLogin,
       enErrors,
       enUserManagement,
+      enChangePassword,
+      enModelConfig,
+      enImageModels,
+      enSystemConfig,
     ];
     const total = modules.reduce((n, m) => n + Object.keys(m).length, 0);
     expect(Object.keys(en).length).toBe(total);
diff --git a/src/i18n/messages/zh/changePassword.ts b/src/i18n/messages/zh/changePassword.ts
new file mode 100644
index 0000000..9903b22
--- /dev/null
+++ b/src/i18n/messages/zh/changePassword.ts
@@ -0,0 +1,13 @@
+export default {
+  changePassword: {
+    title: "修改密码",
+    description: "修改密码后，除当前会话外的所有现有会话都将退出登录。",
+    currentPassword: "当前密码",
+    newPassword: "新密码",
+    confirmPassword: "确认新密码",
+    failed: "无法修改密码。",
+    cancel: "取消",
+    submit: "保存密码",
+    saving: "保存中...",
+  },
+};
diff --git a/src/i18n/messages/zh/dialogs.ts b/src/i18n/messages/zh/dialogs.ts
index ca7ee4e..fa7a22d 100644
--- a/src/i18n/messages/zh/dialogs.ts
+++ b/src/i18n/messages/zh/dialogs.ts
@@ -1,3 +1,16 @@
 export default {
-  dialogs: {},
+  dialogs: {
+    account: {
+      title: "用户信息",
+      description: "您在当前工作区登录的账号。",
+      detailsLabel: "账号详情",
+      username: "用户名",
+      loading: "正在加载账号...",
+      unavailable: "无法获取账号信息。",
+      roles: {
+        admin: "管理员",
+        user: "普通用户",
+      },
+    },
+  },
 };
diff --git a/src/i18n/messages/zh/header.ts b/src/i18n/messages/zh/header.ts
index 5ab44da..44ce2a9 100644
--- a/src/i18n/messages/zh/header.ts
+++ b/src/i18n/messages/zh/header.ts
@@ -2,6 +2,7 @@ export default {
   header: {
     signOut: "退出登录",
     configuration: "配置",
+    account: "账号",
     userInformation: "用户信息",
     changePassword: "修改密码",
     modelConfiguration: "模型配置",
diff --git a/src/i18n/messages/zh/imageModels.ts b/src/i18n/messages/zh/imageModels.ts
new file mode 100644
index 0000000..fb18c31
--- /dev/null
+++ b/src/i18n/messages/zh/imageModels.ts
@@ -0,0 +1,58 @@
+export default {
+  imageModels: {
+    title: "图像模型",
+    description: "管理专用图像生成模型（存储在 config.yaml 中）。仅限管理员。",
+    close: "关闭",
+    loading: "正在加载图像模型…",
+    loadFailed: "加载图像模型失败。",
+    retry: "重试",
+    forbidden: "图像模型配置需要管理员账号。",
+    defaultModel: "默认模型",
+    none: "— 无 —",
+    timeoutSeconds: "超时时间（秒）",
+    modelsHeading: "模型",
+    addModel: "添加模型",
+    empty: "暂无模型。",
+    save: "保存",
+    saving: "保存中…",
+    discardChanges: "放弃更改",
+    unsavedChanges: "未保存的更改",
+    saved: "图像模型已保存。",
+    saveFailed: "保存图像模型失败。",
+    fixParamsBeforeSaving: "请先修正无效的 params JSON 再保存。",
+    apiKeyWriteOnlyNote: "API 密钥为只写：留空则保留已存储的密钥。",
+    card: {
+      newModel: "（新模型）",
+      unnamed: "图像模型",
+      enabled: "启用",
+      test: "测试",
+      testing: "测试中…",
+      remove: "移除",
+      fixParamsBeforeTesting: "请先修正无效的 params JSON 再测试。",
+      testPassed: "{id} 测试通过，耗时 {seconds} 秒。",
+      testPassedBanner:
+        "测试通过，耗时 {seconds} 秒——提供商已使用这些设置完成了一次真实生成。",
+      testFailedToast: "{id} 测试失败：{message}",
+      testFailedGeneric: "测试失败。",
+      testFailedBanner: "测试失败：{message}",
+      modelId: "模型 ID",
+      displayName: "显示名称",
+      provider: "提供商",
+      baseUrl: "基础 URL",
+      defaultSize: "默认尺寸",
+      defaultQuality: "默认质量",
+      apiKey: "API 密钥",
+      apiKeyConfiguredNoHint: "已配置 — 留空则保留",
+      apiKeyConfiguredWithHint: "已配置（{hint}）— 留空则保留",
+      apiKeyNotConfigured: "粘贴你的 API 密钥",
+      showApiKey: "显示 API 密钥",
+      hideApiKey: "隐藏 API 密钥",
+      paramsLabel: "Params（JSON 对象，可选）",
+      paramsErrorPrefix: "Params：{message}",
+      paramsErrors: {
+        notObject: "params 必须是 JSON 对象",
+        invalidJson: "无效的 JSON",
+      },
+    },
+  },
+};
diff --git a/src/i18n/messages/zh/index.ts b/src/i18n/messages/zh/index.ts
index 42155e5..09a2504 100644
--- a/src/i18n/messages/zh/index.ts
+++ b/src/i18n/messages/zh/index.ts
@@ -7,6 +7,10 @@ import panels from "./panels";
 import login from "./login";
 import errors from "./errors";
 import userManagement from "./userManagement";
+import changePassword from "./changePassword";
+import modelConfig from "./modelConfig";
+import imageModels from "./imageModels";
+import systemConfig from "./systemConfig";
 
 export default {
   ...common,
@@ -18,4 +22,8 @@ export default {
   ...login,
   ...errors,
   ...userManagement,
+  ...changePassword,
+  ...modelConfig,
+  ...imageModels,
+  ...systemConfig,
 };
diff --git a/src/i18n/messages/zh/modelConfig.ts b/src/i18n/messages/zh/modelConfig.ts
new file mode 100644
index 0000000..6e81634
--- /dev/null
+++ b/src/i18n/messages/zh/modelConfig.ts
@@ -0,0 +1,115 @@
+export default {
+  modelConfig: {
+    title: "模型注册表",
+    description:
+      "管理提供商、模型、凭据和默认配置。仅限管理员;每次保存都会由后端校验。",
+    collapseAgentActions: "默认折叠智能体操作",
+    close: "关闭",
+    registry: {
+      requestFailed: "请求失败 ({status})。",
+      minHint: "最小 {value}",
+      maxHint: "最大 {value}",
+      inheritPlaceholder: "继承",
+      statusNew: "新",
+      toggleParameters: "切换 {key} 的参数",
+      enabled: "启用",
+      saveBeforeTesting: "请先保存注册表再测试(测试仅针对已保存的模型运行)。",
+      testing: "测试中…",
+      test: "测试",
+      remove: "移除",
+      modelKey: "模型键",
+      displayName: "显示名称",
+      upstreamModelId: "上游模型 ID",
+      contextWindow: "上下文窗口",
+      maxOutputTokens: "最大输出 token 数",
+      temperature: "温度",
+      temperatureUnsupported: "温度(不支持)",
+      capabilities: "能力",
+      capabilityTools: "工具",
+      capabilityVision: "视觉",
+      capabilityStructuredOutput: "结构化输出",
+      advanced: "高级",
+      limitMode: "限额模式",
+      maxInputTokens: "最大输入 token 数",
+      minEffectiveInput: "最小有效输入",
+      systemReserve: "系统预留",
+      toolsReserve: "工具预留",
+      attachmentsReserve: "附件预留",
+      limitsStatus: "限额状态",
+      limitsStatusNeedsConfirmation: "待确认",
+      limitsStatusConfirmed: "已确认",
+      limitsSource: "限额来源",
+      limitsSourceUser: "用户",
+      limitsSourceProvider: "提供商",
+      limitsSourceTestedContract: "已测试契约",
+      topP: "Top p",
+      reasoningEffort: "推理强度",
+      reasoningEffortUnsupported: "推理强度(不支持)",
+      testPassedBanner:
+        "测试通过,耗时 {latencyMs} ms —— 适配器规格版本 {revision},状态 {state}。",
+      testFailedBanner: "测试失败{code}:{message}",
+      removeProvider: "移除提供商",
+      providerId: "提供商 ID",
+      adapter: "适配器",
+      baseUrl: "Base URL",
+      baseUrlHint: "任意公网 HTTPS 端点,或已配置的开发端点之一。",
+      authMode: "认证模式",
+      apiKey: "API 密钥",
+      apiKeyStaged: "已暂存 —— 将随注册表一起保存",
+      apiKeyConfiguredWithHint: "已配置({hint})—— 留空则保持不变",
+      apiKeyConfigured: "已配置 —— 留空则保持不变",
+      apiKeyPaste: "粘贴你的 API 密钥",
+      configuredPlaceholder: "已配置",
+      showApiKey: "显示 API 密钥",
+      hideApiKey: "隐藏 API 密钥",
+      timeoutSeconds: "超时(秒)",
+      maxRetries: "最大重试次数",
+      defaultTemperature: "默认温度",
+      defaultTopP: "默认 top p",
+      defaultReasoningEffort: "默认推理强度",
+      modelsHeading: "模型",
+      addModel: "添加模型",
+      noModels: "暂无模型。",
+      loadFailed: "加载注册表失败。",
+      changedElsewhere: "注册表已在别处被修改 —— 已重新加载最新状态。",
+      saved: "注册表已保存(版本 {revision})。",
+      saveFailed: "保存注册表失败。",
+      primaryNeedsSecondModel: "修改默认主模型需要另一个已启用的模型来接替。",
+      savedDisabled:
+        "注册表已保存(版本 {revision});已修改的模型已被禁用 —— 请在准备好后测试并重新启用它们。",
+      providerRejectedTest: "提供商拒绝了测试请求。",
+      testPassedToast: "{key} 通过了提供商测试。",
+      testFailedToast: "{key} 未通过提供商测试。",
+      testFailedGeneric: "提供商测试失败。",
+      forbidden: "模型配置需要管理员账号。",
+      retry: "重试",
+      loading: "正在加载注册表…",
+      stateBadge: "状态:{state}",
+      revisionBadge: "版本:{revision}",
+      unsavedChanges: "未保存的更改",
+      defaultPrimaryModel: "默认主模型",
+      noneOption: "—— 无 ——",
+      providers: "提供商",
+      noProviders: "暂无提供商。请从下方模板添加。",
+      providerEnabled: "提供商已启用",
+      providerDisabled: "提供商已禁用",
+      providerTemplate: "提供商模板",
+      blankProvider: "空白提供商",
+      addProvider: "添加提供商",
+      templatesFootnote:
+        "模板仅预填适配器、Base URL 和建议模型;保存后的提供商就是一个普通配置。",
+      selectProvider: "在左侧选择一个提供商,或从模板添加。",
+      requestPath: "(请求)",
+      changedModelsDisabled: "已修改的模型将以禁用状态保存:{keys}",
+      changedModelsExplanation:
+        "启用模型需要其在当前配置下通过提供商测试。保存会禁用已修改的模型{repoint};请在准备好后对每个模型执行测试,然后重新启用并再次保存。",
+      repointPrimary: ",并将默认主模型指向 {target}",
+      saving: "保存中…",
+      saveWithDisabled: "保存(已修改的模型将被禁用)",
+      saveRegistry: "保存注册表",
+      discardChanges: "放弃更改",
+      idFootnote:
+        "ID 由小写字母、数字、点、下划线和连字符组成(例如 <mono>zhipu-glm/glm-5.2</mono>):{pattern}。启用模型需要已确认的限额以及当前配置下通过的提供商测试。",
+    },
+  },
+};
diff --git a/src/i18n/messages/zh/systemConfig.ts b/src/i18n/messages/zh/systemConfig.ts
new file mode 100644
index 0000000..c4a7427
--- /dev/null
+++ b/src/i18n/messages/zh/systemConfig.ts
@@ -0,0 +1,73 @@
+export default {
+  systemConfig: {
+    title: "系统配置",
+    description: "系统级参数。仅管理员可用；未设置的字段将回退到环境默认值。",
+    loading: "加载中…",
+    close: "关闭",
+    save: "保存",
+    saving: "保存中…",
+    discardConfirm: "放弃未保存的更改？",
+    saveFailed: "保存失败。",
+    saveFailedStatus: "保存失败（{status}）。",
+    requestFailed: "配置请求失败（{status}）。",
+    tabs: {
+      general: "常规",
+      terms: "登录条款",
+      security: "安全",
+      backup: "数据备份",
+    },
+    general: {
+      wordmark: "文字标识（左上角和登录页）",
+      logo: "Logo",
+      favicon: "网站图标",
+      hint: "支持 PNG、JPEG 或 SVG，最大 512KB。网站图标还支持 ICO。文字标识在保存后生效；上传立即生效。",
+      upload: "上传",
+      restoreDefault: "恢复默认",
+      uploadFailed: "上传失败。",
+      restoreFailed: "恢复失败。",
+      previewAlt: "{label} 预览",
+    },
+    security: {
+      authEnabled: "WebUI 身份验证",
+      sessionTtl: "会话有效期（小时）",
+      passwordMinLength: "密码最小长度",
+      captchaEnabled: "登录验证码",
+      captchaThreshold: "登录失败 N 次后启用验证码",
+      options: {
+        default: "默认（环境变量）",
+        on: "开启",
+        off: "关闭",
+      },
+      confirmAuthOff:
+        "禁用身份验证后，任何能访问该界面的人都可进入。确定继续吗？",
+      confirmAuthOn:
+        "启用身份验证需要在服务器环境中设置 WEBUI_AUTH_SECRET。若未设置，所有页面（包括本对话框）都会返回 503，恢复需要手动编辑 ~/.evoscientist/system-config.json。确定继续吗？",
+      footnote:
+        "留空则保持环境默认值。会话有效期仅适用于新签发的会话；现有会话保持其固定过期时间。",
+    },
+    loginTerms: {
+      showTerms: "在登录页显示条款文本（仅展示）",
+      termsLabel: "条款文本（Markdown）",
+      placeholder: "例如：登录即表示您同意可接受使用政策…",
+      preview: "预览",
+    },
+    backup: {
+      backendDir: "后端数据目录",
+      backendDirPlaceholder: "例如 /srv/evoscientist/data（可选）",
+      scheduled: "定时备份",
+      every: "每",
+      hours: "小时",
+      keep: "保留",
+      history: "备份历史",
+      runNow: "立即备份",
+      running: "备份中…",
+      empty: "暂无备份。",
+      download: "下载",
+      delete: "删除",
+      confirmDelete: "删除 {name} 吗？",
+      backupFailed: "备份失败。",
+      deleteFailed: "删除失败（{status}）。",
+      requestFailed: "备份请求失败（{status}）。",
+    },
+  },
+};