WPML - How to redirect non translated content to English and not to default language

I have a website where the default language is set to Italian. English is the only other language of the site. I need to redirect all other language to english and let users choose italian as well.

'm trying to use the following code but it has some problem. It doesn't work in certain cases when the referer is not empty while entering the page for the first time. Can someone point me on the right direction?

/*
 * WPML browser redirect fix.
 *
*/

function wpml_browser_redirect_fix()
{
  global $sitepress, $post;

  $browser_language_code = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
  $active_languages = $sitepress->get_active_languages();
  $reffered = @$_SERVER['HTTP_REFERER'];

  if (!array_key_exists($browser_language_code, $active_languages)) {
    $language_code = 'en';
    if (!$reffered) {
      if (is_home() || is_front_page()) {
        if ($sitepress->get_current_language() != $language_code) {
          wp_redirect($sitepress->convert_url(site_url(), $language_code));
        }
      } else {
        if ($post->ID) {
          if ($sitepress->get_current_language() != $language_code) {
            $post_type = get_post_type($post->ID);
            wp_redirect(get_permalink(icl_object_id($post->ID, $post_type, true, $language_code)));
          }
        }
      }
    }
  } else {
    foreach ($active_languages as $language_code => $language) {
      if ($browser_language_code == $language_code && !$reffered) {
        if (is_home() || is_front_page()) {
          if ($sitepress->get_current_language() != $language_code) {
            wp_redirect($sitepress->convert_url(site_url(), $browser_language_code));
          }
        } else {
          if ($post->ID) {
            if ($sitepress->get_current_language() != $language_code) {
              $post_type = get_post_type($post->ID);
              wp_redirect(get_permalink(icl_object_id($post->ID, $post_type, true, $language_code)));
            }
          }
        }
      }
    }
  }
}

add_action('wp_head', 'wpml_browser_redirect_fix', 0);