Add Russian l18n

- add Russian localization (except PixenIntro);  
- add missed NSLocalizedString() for every string in
  the app;  
- add all missed keys in Localizable.strings;  
- interpret Credits.html as Unicode (UTF-8) to allow non-ASCII
  characters (for l18n);  
- fix issue with `-duplicatePalette`: now it looks for
  localized « Copy» and «%@ Copy» strings;  

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What about PixenIntro? I guess we should move all .html files in .lproj folders and change some urls:  
`<img id="layers" class="left shadow" src="Layers.png" …`  
  
`<img id="layers" class="left shadow" src="../PixenIntro/Layers.png" …`