Preterite is a good translation. Whether to use that or Praeteritum as the main tag depends on which language it's decided to have main tags in.
However I would say imperfect is the English term that I encountered most when learning German, even though that isn't strictly correct. I've also seen simple past used to teach German to English speakers.
For the sake of learners encountering these terms, they should be synonyms. The tag wiki would be a good place to explain the proper/preferred terminology.