i18n: fixed & added russian translations

[anmorgunov]

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[welcome]

Thanks for opening this pull request! Please check out our contributing guidelines and check for the automated tests.

[ghutchis]

Thanks very much - looks like there are some minor issues with the .po file though. Are the "" matching?

[anmorgunov]

Added another commit with fixes

[welcome]

Congrats on merging your first pull request! 🎉 Thanks for making Avogadro better for everyone!

[github-actions]

Here are the build results
Avogadro2.AppImage
macOS.dmg
Ubuntu-2004.tar.gz
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