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/PaintingDetail.tsx

@@ -1,4 +1,5 @@
 import { useCallback, useEffect, useState, type SyntheticEvent } from 'react';
+import { useTranslation } from 'react-i18next';
 import type { InfluenceLink, Painting, PaintingDetail } from '../types';
 import { api, debugImageProxyUrl, imageUrl, paintingImageUrl, type DebugImageSearchResult, type DebugImageSearchResultItem, type FixPaintingImageResult } from '../api/client';
 import DebugSearchResultsModal from './DebugSearchResultsModal';
@@ -204,6 +205,7 @@ export default function PaintingDetailView({
   onPaintingCheckupFlagsUpdated,
   onPaintingRemoved,
 }: Props) {
+  const { t } = useTranslation('painting');
   const { painting, influencedBy, influenced, annotations = [] } = data;
   const [fullscreen, setFullscreen] = useState(false);
   const [imageVersion, setImageVersion] = useState(0);
@@ -474,15 +476,15 @@ export default function PaintingDetailView({
           </p>
         </div>
         <button className="bio-btn" onClick={onArtistBio}>
-          About {painting.artist_name}
+          {t('aboutArtist', { name: painting.artist_name })}
         </button>
       </header>
 
       <div className="painting-layout">
         <aside className="influence-panel influence-left">
-          <h3>Influenced By</h3>
+          <h3>{t('influencedBy')}</h3>
           {influencedBy.length === 0 ? (
-            <p className="no-influences">No documented influences for this work.</p>
+            <p className="no-influences">{t('noInfluences')}</p>
           ) : (
             <div className="influence-list">
               {influencedBy.map((inf, index) => (
@@ -575,9 +577,9 @@ export default function PaintingDetailView({
         </main>
 
         <aside className="influence-panel influence-right">
-          <h3>Influenced</h3>
+          <h3>{t('influenced')}</h3>
           {influenced.length === 0 ? (
-            <p className="no-influences">No documented works influenced by this painting yet.</p>
+            <p className="no-influences">{t('noInfluencedWorks')}</p>
           ) : (
             <div className="influence-list">
               {influenced.map((inf, index) => (