Ukranian laguage doesn't start with a capital letter (unlike to other languages in list)

I work in international company, where we are using translation to Ukranian. Ukranian is not in the default list of languages. I've added Ukranian to the list. In English version of the account it starts with a capital letter, but when I switch to Russian as my account language Ukranian doesn't start with a capital letter (unlike to other languages in the list). During the meetings this could be considered as an unpolite gesture to my colleagues. How can I change this in the settings? Same situation is valid for any other added language in Russian