You specify the first URL as the search engine can have problem identifying which a person really should be the key URL.  The following tutorial will explain to you how you can allow Canonical URLs in Prestashop 1.5. Redirect on the canonical URL. A supplied PrestaShop webpage might have https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html