Ok, let me clarify a few things about copies first:
1) For the interview, you should bring originals AND copies of everything you already submitted, plus whatever else you think you should bring additionally. Originals because they need to see them, copies because you don't want to give the original if they decide to keep them.
2) They can always lose something in your file, so it is best to go there with originals and copies of everything even though you have already submitted them. In my case, my interview letter actually did ask for it as one of the items in the list.
3) Anything you can easily replace (like a letter from your employer or a transcript) does not need to be copied, you can simply give the original if you want.
4) They just need to see the passport, so no copies needed (unless they misplaced the copies you sent).
5) Copies do not need to be notarized, only the translations need to be notarized.
So to answer your question, anything that needs to be translated to English should have a notarized translation similar to that in the link I have posted before.