[RU] Translation update: (#8147)

* [RU] Translation update:
• Added translation to Welcome timeline
• Doorkeeper: changed date format to more common in Russia
• Doorkeeper: added translation to scopes
• Added translation to Dashboard settings (I didn't have a chance to test it on Live server, so some strings may be a bit incorrect)
• Added translation to Relays settings
• Added translation to Filters settings
• Some other small fixes and improvements

* Quoted string for "joined" key to avoid mapping error

* [RU] Changed "повторить" (repeat) to "исправить" (change, fix) for a more correct translation.

* i18n-tasks normalize