The hreflang “x-default” attribute value alerts to Google algorithms that the web site doesn’t goal any specific language or locale and is particularly the default website page when no other site is better suited. You should use the Hreglang Tag to Permit the search engines know that you've various versions https://addons.prestashop.com/pt/seo-referenciamento-natural/30904-tags-automaticas-hreflang-e-tags-canonicas-seo.html