多国语言
Multi-language books 和 Multi-Languages 介绍了gitbook多国语言版本的文档撰写
repository/
LANGS.md
en/
    README.md
    SUMMARY.md
    ...
fr/
    README.md
    SUMMARY.md
    ...
Since gitbook can generate a book from a directory like en or fr, it can detect the LANGS.md file which should follow the format: