There is room for improvement here. Wiki could detect language preferences based on accept-language Header. "en-US,en;q=0.9,pl;q=0.8" is a pretty good indication I want English and Polish translations to be the first one listed. Alternatively/additionally you could let logged in users define sort order/preferences.

As is now I have to inject

    ['.vector-menu-content-list .interlanguage-link.interwiki-en', '.vector-menu-content-list .interlanguage-link.interwiki-pl'].forEach(el =>{
      if (document.querySelector(el))
      {
        el.style = ''
        let lang = document.querySelector(el)
        lang.parentNode.insertBefore(lang, lang.parentNode.firstChild)
      }
    })