feature/add more languages

[codebude]

• Add i18n translation files for es, fr and zh
• Load new languages into app
• Update readme and docs regarding new languages

[github-actions]

🧪 Test Results — 7b2f939

✅ Backend (pytest) — 708 passed, 0 failed, 0 skipped (708 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 375 passed, 0 failed, 0 skipped (375 total)
✅ E2E (Playwright) — 54 passed, 0 failed, 0 skipped (54 total)

Summary: ✅ All 1191 tests passed