Update Localization_ru.json

Sébastien,

Not sure if you have seen the comment I did previously on the editing, but just to make sure it gets through I will repeat.

I had to change few lines that were NOT marked with TODO to be consistent across the file with translation of "Tag".
I have chosen a word that would be understood by "a grandmother", instead of a geek term that would mean something to either geeks themselves or English speaking people.

I have also struggled with "Alphabetical index of no author" (and similar). 
My understanding is that this in layman's terms means:
"Alphabetical index of books with no author indicated".
Translation was done with this assumption in mind.

Hope this helps