update cy translation
update cy translation

Change-Id: Ia7bfb3f3e68728fef2f9efaa7192148bfc1ee1ea
Reviewed-on: https://gerrit.instructure.com/212834
Tested-by: Jenkins

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