The Utah Courts have put up online the pdf form that can be used to request an interpreter (Spanish version). Here is the instruction page.
As the instruction page says:
You must request a court interpreter at least 3 days before the hearing, or the hearing may have to be postponed. To request a court interpreter, call the court that is holding the hearing or file a Request a Court Interpreter form with that court.
A nice step forward.
Does any court yet let you file the request online?