Update, fix, and finish Russian translation.

This change affects only the Russian translation.

I used English translation as the source.
All strings are translated now. Capitalization fixes.
In some places translation was not done word-to-word, but it better reflects the actual meaning.

Minor differences:
* «Photo, Video, Audio, Rich» is translated as «video, audio, photo, etc.» (the `title` string), which sounds better from my point of view. Old translation was: «Photo, Video, etc.».
* In `noresize` string «use default» was translated as «standard size» (similar to Deutsch translation).