No one needs permission to translate Firefox into any language- it is
open to anyone to do it. Please start whenever you are ready.
This list should be able to help you get started if you have questions, etc.
I've created https://bitbucket.org/mozillal10n/ady-ru/ for your cloning
pleasure on bitbucket.
I've used ady-RU because
http://www.ethnologue.com/show_language.asp?code=ady indicates that
there are significant populations in the Russian Federation using
Cyrillic script, and in Turkey using Latin script.
I guess it'd be helpful for you if there'd be someone in this group
volunteering to help you out, we call that a mentor. I assume that's
best if that person can communicate with you on Russian?
PS: Please keep the list on CC when you reply