update ru translation
update ru translation

Change-Id: If30796f5f2306c368f906a385950bea0eb18f09f
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/216808
Tested-by: Jenkins

sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms