update ru translation
update ru translation

Change-Id: I96a51f2e4ed9e0cd1fbdcc5945c3d607d4fd9e75
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/270464
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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