It’s unlikely you’ll ever produce web site versions targeting all languages and areas. Sometimes, you’ll require to present Google an indication of what do to every time a supplied area or language isn’t readily available or doesn’t exist. An x-default tag would be the URL that Google displays.  You need https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html