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: