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/tsconfig.app.json

@@ -12,6 +12,7 @@
     "allowImportingTsExtensions": true,
     "verbatimModuleSyntax": true,
     "moduleDetection": "force",
+    "resolveJsonModule": true,
     "noEmit": true,
     "jsx": "react-jsx",