The product page is working a little in a different way. You won't find a language selector for every textual content subject, but relatively a normal language selector at the highest with 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/free-modules/prestashop-social-media-like-floating-sidebar-on-left-and-right-side-on-all-pages.html