update ru translation
update ru translation

Change-Id: I4829d93a7944bce15e3594feb3c227566dbf8b37
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/288193
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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