I installed the French add-on on my zen-cart.

However, the special characters are changed for some weird code...

à for à
é for é
ô for ô
è for è
etc...

That's fine for the web site as the code is changed for the real character.

However in the emails sent to the French customers, the code is shown instead of the character.

Here is an example:
Nous vous remercions de votre confiance !
Voici les détails de votre commande.
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Numéro de commande : 1
Date de commande : vendredi 06 août 2010 Facture détaillée :


How can I change that so the emails look good and are readable.