Different header button for different pages

Hi, I figured it out how to make my website in two languages but only the navigation and pages. So the main button in header is still in one language. (donate button) Someone can help me with a new code ? or maybe some change in the code I already have in footer advanced injection section. THANK YOU! 🙂

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
  $(function() { 
  /* SETUP MULTI-LANGUAGE */
  var defaultLanguage = 'fr';
  var lang = location.pathname.split("/")[1];
  var defaultClass = 'lang-'+defaultLanguage+'';
  var itemParent = "nav [class*='collection'],nav [class*='folder'],nav [class*='index'],nav [class*='group']";
  if (lang == "" || lang.length > 2 ){
    var lang = defaultLanguage;
  }

  /* ADD LANGUAGE CLASSES */
  $('a[href="/"]').addClass('lang-'+defaultLanguage+'').parents(itemParent).addClass('lang-'+defaultLanguage+'');
  $('nav a:link:not([href^="http://"]):not([href^="https://"])').each(function () {
    var langType = $(this).attr('href').split("/")[1];
    var multiLanguageClass = 'multilanguage lang-' + langType + '';
    if (undefined !== langType && langType.length <= 2) 
      $(this).addClass(multiLanguageClass).parents(itemParent).addClass(multiLanguageClass);
  });
  $('nav button').each(function () {
    var langTypeFolder = $(this).attr('data-controller-folder-toggle').split("/")[0];
    var multiLanguageClass = 'multilanguage lang-' + langTypeFolder + '';
    if (undefined !== langTypeFolder && langTypeFolder.length <= 2) 
      $(this).addClass(multiLanguageClass);
  });

  /* HOMEPAGE-LOGO LINKS TO PROPER LANGUAGE HOMEPAGE */
  if (lang == "en") {
    $('a[href="/"]').attr("href", "/cover/");
  }

  /* ADD EXCLUSION NAV ITEMS */
  $('.exclude-me,.exclude-me a').addClass('exclude');
  $('.sqs-svg-icon--list a,.SocialLinks-link').addClass('exclude');

  /* REMOVE OTHER LANGUAGES AND KEEP EXCLUDED ITEMS */
  $('.multilanguage:not(".lang-'+lang+',.exclude")').remove();
});
</script>

Hi. What is site url? We can check easier