Unfortunately from what I've been able to find on the Internet it seems like other PrestaShop users have also encountered similar issues when attempting to use foreign languages as their search engine friendly URLs.
It seems that PrestaShop should be able to handle accented characters, but it was noted by one user that they encountered the same problem when their product had an apostrophe in it as well.
Another user also mentioned this can happen when you directly paste the name of a product into PrestaShop instead of manually typing it in.
Also what version of PrestaShop are you currently running? As it seems other users having similiar issues were able to resolve them with the 22.214.171.124 "BO : fixed accentuated URLs in products" patch.
Please let us know if either of those solutions worked for you.
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