Localize source admin controls

[ohld]

Summary

• Localize meme source admin cards, status buttons, and callback answers for moderator source management
• Replace the verbose technical source dump with a compact stats card
• Cover the Russian compact card and localized status buttons with tests

Tests

• DATABASE_URL=postgresql+asyncpg://app:app@localhost:65432/app REDIS_URL=redis://:myStrongPassword@localhost:36379 CORS_ORIGINS='[]' CORS_HEADERS='[]' TELEGRAM_BOT_TOKEN=test TELEGRAM_ADMIN_BOT_TOKEN=test OPENROUTER_API_KEY=test python -m pytest tests/ -x -q
• python -m ruff check src tests
• python -m ruff format --check src tests