[Feature]: Translate the application into Russian

[itsalaidbacklife]

Feature Summary

We should translate the application into Russian as a part of the broader internationalization effort

Detailed Description

Now that the translation system (using vue-i18n) is in place, we can translate the application into other languages.

For this issue, we should translate the entire application into Russian. This should be accomplished by:

1. Creating an src/translations/rus.json file to mirror src/translations/en.json
2. Updating src/i18n.js to import and consume the new rus.json translation file
3. Updating tests/e2e/specs/out-of-game/translations.spec.js to test the rus.json file contents by comparing to the others