update cy translation
update cy translation

Change-Id: I90527a5e0f16b240f7d2448503d595b65e3ad211
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/223610
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>

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