Ukr and Rus language fixes

- Added Ukrainian alphabetic and PC keyboard layouts
- Fixed Ukrainian langinfo.xml
- Fixed Russian langinfo.xml

P.S. I hope, now I've done everything OK.
I'd like to point your attention that `gui` parameter `unicodefont="true"` is differs from `gui` value.
You can always check sources: https://github.com/xbmc/xbmc/blob/master/xbmc/LangInfo.cpp#L289
This make sense especially if wiki article is marked as "outdated".