The hreflang “x-default” attribute value alerts to Google algorithms the web site doesn’t goal any distinct language or locale which is the default web page when no other web site is best suited. Suitable implementation: Make sure hreflang tags are effectively executed Which language codes align with ISO benchmarks. You https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/30904-automatische-hreflang-tags-en-canonieke-tags-seo.html