Added translation using Weblate (Russian)

[TatevikGr]

Summary

Added translation using Weblate (Russian)

Unit test

Are your changes covered with unit tests, and do they not break anything?

You can run the existing unit tests using this command:

vendor/bin/phpunit tests/

Code style

Have you checked that you code is well-documented and follows the PSR-2 coding style?

You can check for this using this command:

vendor/bin/phpcs --standard=PSR2 src/ tests/

Other Information

If there's anything else that's important and relevant to your pull request, mention that information here. This could include benchmarks, or other information.

If you are updating any of the CHANGELOG files or are asked to update the CHANGELOG files by reviewers, please add the CHANGELOG entry at the top of the file.

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