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Only use an accent where it affects a word's pronunciation:
I'll have the paté, please.
Or when it's actually part of a person, place or book's name:
Arsène Wenger and Beyoncé were seen at the book launch of My life: an exposé, held at Café Déjà Vu.
If it's in an unfamiliar foreign word, the whole thing should also be in italics:
Wolfgang extolled the virtues of spätzle noodles.