Hreflang="en-us": the ISO code for that language used on the website page, accompanied by the ISO code for that nation at which that webpage is aimed (the country/area code is not always demanded) che voi sappiate c'e' modo di integrare nel codice di prestashop il tag per Google Tag Manager https://tornadosocial.com/story4328684/the-definitive-guide-to-automatic-hreflang-tags-canonical-tags-all-pages-seo