Add machine-translated content for Traditional Chinese (zh-TW), Korean, German,
Turkish, French, Spanish, Brazilian Portuguese (pt-BR), Ukrainian, Hindi,
Indonesian, Burmese, Thai and Arabic. Japanese keeps its official translation.
Only prose is translated; code, commands, paths, links and anchors preserved.
Translated navigation labels added to mkdocs.yml for every language.
Builds clean with mkdocs --strict (15 languages).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Shirofune-Security