Reproduced this on both the provided webpage and a fairly arbitrary Wikipedia article.
I have not been able to find an example of a webpage which successfully translates into Ukrainian.
I notice the translation URL includes "/en/uk/", as per the ISO 639 standard. While that strikes me as being correct, I wonder if any dependencies might be expecting "ua" or "ukr" for this language instead? It's just a thought.
Я проголосував за підтримку цього)