Add russian language

[Domanffe]

Please add the Russian language, it will help a lot in setting up the settings and so on.

[Minh141120]

Hi @Domanffe,
We probably won't do a PR request to do translation atm, as we are trying to set up a weblate for our community to contribute from there instead.

We'll try to bring it soon, sorry for any inconvenience!

[Domanffe]

Oh well, I'll be waiting.