update ru translation
update ru translation

Change-Id: I5412e7b92788bfeb0b9c2c0ca7d787aa24e3b37f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/278948
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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