Nice to see you around, Marcos!
I won't touch the 8.5 Manual until Warren gets an alpha out. But in the meantime, I am thinking that the first 4 sections of the User's Manual will be probably untouched, so any translation that exists can be used with little change. Section 5 (Configuration) is a different story, and I imagine that will need major revision. Sections 6 and 7 again are probably going to be fine as they are. So if you have time, I would say to concentrate on Sections 1-4, 6, and 7.
I would like to use a version control, but don't know much about that sort of thing. Open to ideas. Quanta has its own update methods that we used last time, and SilverBear might be able to help us here if he is up to it.
Production: 4.7.0-0.bpo.1-amd64, MX-15 RC1, AMD FX-4130 Quad-Core, GeForce GT 630/PCIe/SSE2, 8 GB, Kingston SSD 120 GB and WesternDigital 1TB
Testing: AAO 722: 3.16-0-4-686-pae. MX-15, AMD C-60 APU, 4 GB