The product page is performing a little bit in different ways. You will not find a language selector for each text industry, but instead a standard language selector at the best on the page. Once you've picked a language you could then change many of the contents in this language. https://www.presta-addons-modules.com/es/seo/prestashop-seo-automatic-open-graph-twitter-cards-tags-on-all-pages.html