@aileen_s21 I doubt Maxis will add a Ukranian translation to Sims 4 at this late date, although perhaps feedback like this will make the team consider it for Sims 5. In the interim, it might be possible to create a community project to provide translations as a mod of some kind. I don't have any modding skills and wouldn't know how this works; I'm just saying it seems feasible in theory. And the project would need translators as well as a coder.
I doubt EA would help in any way since it would at the very least involve modding, which is accepted but not officially supported. And sharing program files, rather than distributing a mod, if that's how the translation was provided, would get into territory that might technically violate the terms of service.
Still, I'm sure that you're not the only Ukranian who would enjoy playing in your language, and it would be wonderful to see a solution to this even if it had to come from the community.