Header/Logo
I can do that, I am also looking to add this in as a part of the user manual too so eventually, that would be a link to the page when it's created. But for now, I could just write a short tutorial on how that needs to be done? sound good to you?
Translations
Yes it was left out because I didn't see an appropriate place for it to go, I.E. no section for translations, but as you've pointed that out I've ported it over just now. (literally just finished it), and added the link in the FAQ.
Adding Languages
I think that would be a good place to put it, also for the admin section of the user manual?