feat(dev_tools): add translation editor for browsing and editing UI translations

New admin page to browse, search, compare, and inline-edit translation
keys across all modules and languages from the browser.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/dev_tools/routes/pages/admin.py

@@ -149,6 +149,21 @@ async def admin_platform_debug_page(
     )
 
 
+@router.get("/translation-editor", response_class=HTMLResponse, include_in_schema=False)
+async def admin_translation_editor_page(
+    request: Request,
+    current_user: User = Depends(
+        require_menu_access("translation-editor", FrontendType.ADMIN)
+    ),
+    db: Session = Depends(get_db),
+):
+    """Render translation editor page."""
+    return templates.TemplateResponse(
+        "dev_tools/admin/translation-editor.html",
+        get_admin_context(request, db, current_user),
+    )
+
+
 @router.get("/sql-query", response_class=HTMLResponse, include_in_schema=False)
 async def admin_sql_query_page(
     request: Request,