update cy translation
update cy translation

Change-Id: Ia949b71fd40458652516756fa4de0c69351c1e63
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/279037
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