[ru] Localize stateless-apps.md

[vickylikh]

Describe your changes

This PR adds RU localization of stateless apps.

Related issue number #3338

Checklist before opening this PR (put x in the checkboxes)

• [x] This PR does not contain plagiarism
  • don’t copy other people’s work unless you are quoting and contributing it to them.
• [x] I have signed off on all commits
  • signing off (ex: git commit -s) is to affirm that commits comply DCO. If you are working locally, you could add an alias to your gitconfig by running git config --global alias.ci "commit -s".

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[kirkonru]

Hi! A few minor sugs from me 😃

[shurup]

@kirkonru please, feel free to re-approve it and squash & merge :pray: