update cy translation
update cy translation

Change-Id: I8493ce6a18391ba8c65b3d493c808a888ad0eff8
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/299798
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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