More fixes to Ukrainian: literary standard fix plus special case for 11 hours processing

What I've done:    
- Fixed Ukrainian pseudo-dual (plural for few) forms for days and months to fit the literary standard (mea culpa, didn't notice this when made the previous PR);
- Added special processing for 11 hours. @ichernev, you'll understand (as you can read Cyrillic :)). the thing is that in Ukrainian we say hours with preposition о (which I've fixed in the previous PR). However, the number 11 starts with a vowel (as in Bulgarian, but from о, not from е). And, if the next word starts with a vowel, о becomes об, so о десятої (at 10 o'clock), but об одинадцятої (at 11 o'clock).