Hi Morr,
Thanks for reaching out.
It appears to be a conflict between your translation plugin/script and the page. The translation affecting the scripts of the theme hence making them non-functional, and since the tab is operated with the script then it’s not working. This is just assumption as there are many possible causes too.
Could you try disabling your site’s optimization like cache, minification, and CloudFlare? Then please test it too and let me know so I could check it as well.
But I think the real reason is the translation replaces the content of the page, because if you do that without even a translation (an ajax and DOM for example), the binded scripts will not work since it’s actually a different content/elements once it’s replaced. You may try another translation plugin that doesn’t translate it through DOM like your current one.
Thanks!