update cy translation
update cy translation

Change-Id: I0da5318dd22e6b575e8cad8e90e8ba5f14f5d181
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/213716
Tested-by: Jenkins

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