Update uk.locale

Translated several strings, put some commas, capitalized letter 'в' in a polite form 'Ви' (=You), made some other corrections.
Translated but didn't uncomment some unclear phrases for me.
Hope, I didn't delete smth on the go. Would be glad to be helpful.
Merge pull request #1896 from AtaZh/patch-1

Update uk.locale