Add Russian i18n with DB translations, locale API, and curator review UI.

UI chrome via react-i18next, catalog text in entity_translations with ru.wikipedia seeding, locale-aware search, and Translations page for publish workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/components/CuratorLoginModal.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useState, type FormEvent } from 'react';
+import { useTranslation } from 'react-i18next';
 import './CuratorLoginModal.css';
 
 interface Props {
@@ -8,6 +9,8 @@ interface Props {
 }
 
 export default function CuratorLoginModal({ open, onClose, onLogin }: Props) {
+  const { t } = useTranslation('debug');
+  const { t: tc } = useTranslation('common');
   const [username, setUsername] = useState('');
   const [password, setPassword] = useState('');
   const [error, setError] = useState<string | null>(null);
@@ -32,7 +35,7 @@ export default function CuratorLoginModal({ open, onClose, onLogin }: Props) {
       await onLogin(username.trim(), password);
       onClose();
     } catch (err) {
-      setError(err instanceof Error ? err.message : 'Login failed');
+      setError(err instanceof Error ? err.message : t('loginFailed'));
     } finally {
       setSubmitting(false);
     }
@@ -47,13 +50,13 @@ export default function CuratorLoginModal({ open, onClose, onLogin }: Props) {
         aria-modal="true"
         onMouseDown={(e) => e.stopPropagation()}
       >
-        <h2 id="curator-login-title">Curator login</h2>
+        <h2 id="curator-login-title">{t('loginTitle')}</h2>
         <p className="curator-login-hint">
           Debug tools and catalog edits require a curator account.
         </p>
         <form onSubmit={handleSubmit}>
           <label className="curator-login-field">
-            <span>Username</span>
+            <span>{t('username')}</span>
             <input
               type="text"
               autoComplete="username"
@@ -64,7 +67,7 @@ export default function CuratorLoginModal({ open, onClose, onLogin }: Props) {
             />
           </label>
           <label className="curator-login-field">
-            <span>Password</span>
+            <span>{t('password')}</span>
             <input
               type="password"
               autoComplete="current-password"
@@ -77,10 +80,10 @@ export default function CuratorLoginModal({ open, onClose, onLogin }: Props) {
           {error && <p className="curator-login-error">{error}</p>}
           <div className="curator-login-actions">
             <button type="button" className="curator-login-cancel" onClick={onClose} disabled={submitting}>
-              Cancel
+              {tc('cancel')}
             </button>
             <button type="submit" className="curator-login-submit" disabled={submitting}>
-              {submitting ? 'Signing in…' : 'Sign in'}
+              {submitting ? t('saving') : t('signIn')}
             </button>
           </div>
         </form>