update ru translation
update ru translation

Change-Id: I5ed8bb5931f4a9073388c50879e06f33cf05436c
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/221609
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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