The administration can elect to permit or disable currency and language auto-change attributes. Also, alter the default retail outlet currency and language from the module management page. - Really helps to redirect the customer towards the right retail store URL with the shipping method as per the customer's country spot. https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html