Failed to register/update a ServiceWorker for scope ‘%1$S’: Bad Content-Type of ‘%2$S’ received for script ‘%3$S’.  Must be a JavaScript MIME type.
Wedi methu â chofrestru /update ServiceWorker ar gyfer cwmpas ‘%1$S’: Bad Content-Type of ‘%2$S’ a dderbyniwyd ar gyfer sgript '%3$S'. Rhaid bod yn fath MIME JavaScript.