GitBook co-founder here. We have a lot of non-english books actually: https://www.gitbook.com/explore, over a thousand in chinese alone.
In the upcoming 2.0.0 release, we've further improved internationalisation: https://github.com/GitbookIO/gitbook/tree/master/theme/i18n We automatically detect your book's language (or you can specify itself) and so then the build chain can automatically use translations for menu entries etc ... if available in your language.
In the upcoming 2.0.0 release, we've further improved internationalisation: https://github.com/GitbookIO/gitbook/tree/master/theme/i18n We automatically detect your book's language (or you can specify itself) and so then the build chain can automatically use translations for menu entries etc ... if available in your language.