Update Localization_ru.json

Sébastien,

Updated Russian translation.
Please note that I had to change some lines that were NOT marked with TODO tag, to keep consistency across the file.

One thing that I struggled with is:
"Alphabetical index of absolutely no author" (and similar phrases).
My understanding of this line in layman's terms is:
"Alphabetical index of books with no author indicated"
Russian translation is based on this understanding.

Also "Tag" is translated to a proper Russian word, that would be understood by "a grandmother" (instead of translitaration of tag, which would be only understood by English speaking people and IT-geeks).

Cheers