Invalid characters in Username

Hi

So basically if I enter username at registration in Cyrillic, it will tell me that there are invalid characters.

The same with the name and last name, but at least there I turned of “alphabetic check”, which should have allowed for Cyrillic as well (that is also alphabetic, by the way).

This should not happen!!! I have a website in Cyrillic, most users will try Cyrillic or extended Latin ??