Userscript to add legendary count to Steam Hunters profile headers

[SH] Legendary Count.user.js

// ==UserScript==
// @name [SH] Legendary Count
// @description Shows legendary achievement count on user profiles.
// @version 0.3.1
// @changelog 0.3.1 - enable auto-updating
// @changelog 0.3 - Add link to list of achievements on text label
// @author Sellyme
// @match https://steamhunters.com/id/*
// @match https://steamhunters.com/profiles/*
// @exclude https://steamhunters.com/id/*/apps/*
// @exclude https://steamhunters.com/profiles/*/apps/*
// @downloadURL https://gist.githubusercontent.com/Sellyme/6c27bce46447d95eabcf402cf4e66e5a/raw
// @updateURL https://gist.githubusercontent.com/Sellyme/6c27bce46447d95eabcf402cf4e66e5a/raw
// @grant GM_addStyle
// ==/UserScript==

GM_addStyle('.legendary_liststat { color: unset !important; }');
GM_addStyle('.legendary_liststat:hover { text-decoration: underline; }');

(function(){
    (new MutationObserver(check)).observe(document, {childList: true, subtree: true});
})();

function check(changes, observer) {
   //only run onece profile JSON object is loaded
   if (typeof sh !== 'undefined') {
       observer.disconnect();
       inject_legendaries();
   }
}

function inject_legendaries() {
    var stat_header = document.getElementsByClassName('list-stats')[0];
    var li = document.createElement('li');
    console.log(sh.model.steamUser.steamId);
    var html_text = "<div><span>" + sh.model.steamUser.legendaryAchievementUnlockCount.toLocaleString() +
        "<i class='icon icon-certificate' style='color:rgb(255,160,64)' aria-hidden='true'></i></span><name><a href=" +
        "'https://steamhunters.com/profiles/" + sh.model.steamUser.steamId + "/achievements?rarity=legendary'" +
        " class='legendary_liststat'>legendary achievements</a></name></div>";
    li.innerHTML = html_text;
    stat_header.appendChild(li);
}