Ukrainian letters encoding

[Zfz]

I don't think it's an encoding problem. It's a common issue that happens when the font being used doesn't actually contain those characters. The font may be Unicode, but often fonts targeted for certain markets will skip the characters for other languages.

True Unicode font that contains every single character for every single language in the world is huge, so nobody really uses them.

That said, alphabet-based languages are easy to deal with, and I don't see harm in asking the devs to put in Ukrainian characters. Something like Chinese is a completely different matter, as there are easily thousands of characters needed just to sustain a regular conversation, and it would be prohibitively costly for Squre Enix.