feat: Add Traditional Chinese (zh-TW) locale support with complete translations

[occultsound]

📋 Summary

This PR adds complete Traditional Chinese (Taiwan) locale support to Nginx Proxy Manager, including UI translations and help documentation.

🎯 Changes

New Files Added

• Translation file: frontend/src/locale/src/tw.json (171 translation entries)
• Help documentation (Traditional Chinese):
  • frontend/src/locale/src/HelpDoc/tw/AccessLists.md
  • frontend/src/locale/src/HelpDoc/tw/Certificates.md
  • frontend/src/locale/src/HelpDoc/tw/DeadHosts.md
  • frontend/src/locale/src/HelpDoc/tw/ProxyHosts.md
  • frontend/src/locale/src/HelpDoc/tw/RedirectionHosts.md
  • frontend/src/locale/src/HelpDoc/tw/Streams.md
  • frontend/src/locale/src/HelpDoc/tw/index.ts

Modified Files

• frontend/check-locales.cjs - Added tw locale configuration
• frontend/src/locale/IntlProvider.tsx - Registered Traditional Chinese locale
• frontend/src/locale/src/HelpDoc/index.ts - Registered tw help documentation
• frontend/src/locale/src/lang-list. json - Added locale display name

🌐 Locale Details

• Locale Code: tw
• Language Tag: zh-TW
• Display Name: 繁體中文 (Traditional Chinese)
• Flag Code: TW (Taiwan)
• Translation Coverage: 100% (171/171 strings)

✨ Features

✅ Complete UI translation in Traditional Chinese
✅ All help documentation translated
✅ Proper flag icon mapping (Taiwan flag)
✅ Follows existing locale implementation pattern
✅ No breaking changes to existing code
✅ Maintains backward compatibility

💡 Additional Notes

This translation uses Traditional Chinese characters commonly used in Taiwan (台灣正體), which differs from Simplified Chinese (zh-CN). The translation maintains technical accuracy while using terminology familiar to Taiwanese users.

🙏 Acknowledgments

Thank you for considering this contribution! Traditional Chinese support will benefit many users in Taiwan, Hong Kong, and Macau regions.

[nginxproxymanagerci]

CI Error:

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
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Digest: sha256:d0b63960c7f2841f9c5cf3c72427ed130155c361f5c778cda400061f4ebce385
Status: Downloaded newer image for nginxproxymanager/nginx-full:certbot-node
docker.io/nginxproxymanager/nginx-full:certbot-node
�[1;34m❯ �[1;36mBuilding Frontend ...�[0m
yarn install v1.22.22
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
warning " > @uiw/react-textarea-code-editor@3.1.1" has unmet peer dependency "@babel/runtime@>=7.10.0".
[4/4] Building fresh packages...
Done in 29.50s.
yarn run v1.22.22
$ biome lint
Checked 216 files in 81ms. No fixes applied.
Done in 0.17s.
yarn run v1.22.22
$ formatjs compile-folder src/locale/src src/locale/lang
[@formatjs/cli] [WARN] Error validating message "undefined" with ID "language-name" in file "src/locale/src/tw.json"
TypeError: Cannot read properties of undefined (reading 'length')
    at Parser2.isEOF (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:12607:49)
    at Parser2.parseMessage (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:12076:24)
    at Parser2.parse (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:12072:23)
    at parse6 (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:12876:55)
    at compile7 (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:18728:67)
    at async Promise.all (index 12)
    at async compileFolder (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:18792:19)
    at async _Command.<anonymous> (/app/frontend/node_modules/@formatjs/cli/bin/formatjs:231568:5)
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.