Failed to register/update a ServiceWorker for scope ‘%1$S’: Bad Content-Type of ‘%2$S’ received for script ‘%3$S’.  Must be ‘text/javascript’, ‘application/x-javascript’, or ‘application/javascript’.
Methwyd cofrestru/diweddaru ServiceWorker ar gyfer sgôp ‘%1$S’: Content-Type gwael o ‘%2$S’ wedi ei dderbyn ar gyfer sgript ‘%3$S’.  Rhaid ei fod yn ‘text/javascript’, ‘application/x-javascript’, neu ‘application/javascript’.