I am in The Netherlands and as such am trying to change the slug services to the Dutch word for that Diensten.
Through searching I found earlier topics like https://athemes.com/forums/topic/rename-services-to-products-and-edit-services-permalink-pages/ and found your answer. But same as the other people in that link at the end: whenever I just change the slug and save the permalink structure the only thing that happens is that the whole widget disappears. Only when I change the slug back to services it works again.
My website is www.rijnweb.nl.
Please advise what to do.