update ru translation
update ru translation

Change-Id: If392ec71eff9d30337c8719979e54d2eda8e5bb4
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/233822
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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