Hi marc-eu, thank you for taking the time to report this bug!
The missing translation ((null)) should be fixed in the next update.
For the lack of space to accomodate long titles in the menu, we're currently discussing how to update our menus to solve this issue along with other issues with have with out current menus. This discussion is part of a minor redesign effort of our menus. We're working on it.
I'll mark this ticket as "Next Release" for the missing translation, and the wider discussion about menus redesign is handled elsewhere.
Thank you for your help in making Orion a better browser!