[tldoc] [Russian] Small update to TLMGR translation

[Norbert Preining]

Hi Vladimir,

thanks for the update, installed in svn.

> as TeX Live 2021 is in preparation stage I updated Russian translation for
> TLMGR.

Best

Norbert

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PREINING Norbert                              https://www.preining.info
Fujitsu Research Labs  +  IFMGA Guide + TU Wien + TeX Live + Debian Dev
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