I assume that it's not translated. Lots of europeans, exspecially younger ones, are pretty fluent in English. So I assume they are still writing everything in English, the editor just helped out to keep it all neat.Damn I always thought English was their first language, considering how well their story development and jokes carried over.
Either their jokes/storytelling were so good it was universal, or the translator was very good at their job (prob both), hopefully whoever's replacing them will be just as good
I would be really surprised if everything was written in Spanish and translated over.