Made some polishes to some Russian translations

* The translation for a "Tier" rocket literally meant "Level" rocket in Russian. I changed that meaning to "Generation" which I think sounds cooler. 
* Made all the necessary translations where it was needed. 
* Main goal was to make all the translations sound more technical while still being user friendly.

Will revise all the translations again soon. If any help is needed with Russian or Italian translations, will be happy to contrubute :)