there are updated strings to translate on translation site.

One thing to note is many new strings in 3.8, because it include now strings for Bug 6709 and others.

What I recommend is for the moment concentrate your efforts on 3.12,and then 3.10. 

I will update 3.8 files using 3.12 and 3.10 translations to ease the work, but this afternoon (GMT-3).

Regards,

Bernardo