[Translate ru] Accessibility -> focus

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Whoops!

There were 2 critical errors that broke the build and prevented it from being automatically deployed.

ERRORS
src/content/ru/fundamentals/accessibility/focus/index.md#L146 - Cannot find contributor (ann40a) in contributors file.
src/content/ru/fundamentals/accessibility/focus/index.md#L146 - '{% include %}' found, but couldn't find related include: web/_shared/contributors/ann40a.html

[ilyaspiridonov]

@DmitrySkripunov Can you please check the issue with contributors?
I understand Anna was adding herself as contributor in your fork of the repo, but that change hasn't been merged to the upstream repo.
@agektmr Otherwise translation reviewed