The Book module does not fully use the new translation features we have. It doesn't translate the node titles in the different menus it generates.
Steps to reproduce:
- Configure Book content type for translation
- Enable a second language
- Create a book outline in English
- Translate each node in the outline
- Navigate the book in the second language
The nodes get loaded correctly, in the correct language. However, the navigation in the node footer, as well as the Book block, display the node titles in English, which is incorrect.
I'm the maintainer of the Book Translation module. D8 will make much of the module obsolete (which is great). However, it misses this small part.