Comment # 2 on bug 930688 from Stakanov Schufter

Thank you. Effectively the problem was the "preferred language". I would file
this as a bug too. If I choose at install Italian as my preferred language, I
would no expect as a user that this further step has to be set in order to have
the menus translated. 
You can close this, as invalid if you wish. However I would suggest you leave
it opens as a feature request because the current status is unsatisfying. 

A user installing the system in Italian should have Italian as language tabs
but should be able to overrule this with another language if wanted. Then it
would make sense, otherwise AFAIU not. 

Cheers for this quick solution.