update ru translation
update ru translation

Change-Id: I267a2e00b410b26e5d713e25ff9c5fb7a1226459
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/215571
Tested-by: Jenkins

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