update cy translation
update cy translation

Change-Id: I07e07fce4f3fa3b99c2a85021c23870b7b54c915
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/302870
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