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.
What does it mean? I've checked other language and they use their respective Win CPxxxx encodings. Also the Wiki says (quote):
---
The <charset> section: <gui>: Specifies the character encoding of everything within XBMC that is not unicode. E.g. id3 tags with none unicode encoding.
---
So what are the correct values here after all?