Do you know any collaborative translation tool?
I've seen the suggestions in this answer, but I'm specifically searching for a tool to translate books (so large documents made of paragraphs, mostly), with possibility for other users to check/correct/validate other users' translations, roles (admins, validators...), and if possible something that has a nice API so I can convert the result into LaTeX to publish the book.
The tool could be SaaS (preferably free) or open-source (to be hosted on LAMP or similar).