The translation was done manually. Translated somewhere by a translator. If something was translated incorrectly or is unclear - write! I will be glad to comments. Corrections will not take long to arrive.
Installation:
Upload the Russian.json file along the path:
Steam version: X:SteamsteamappscommonGrand Theft Auto VmenyooStuffLanguage Not Steam: X:GTAVmenyooStuffLanguage
and in the trainer language settings select Russian =)