Duolingo XP Bar for Greasemonkey/TamperMonkey

// ==UserScript==
// @name        th23 Duolingo
// @namespace   th23-duolingo
// @include     https://www.duolingo.com/*
// @include     http://www.duolingo.com/*
// @version     1
// @grant       none
// ==/UserScript==

function inject(f) { //Inject the script into the document
    var script;
    script = document.createElement('script');
    script.type = 'text/javascript';
    script.setAttribute('name', 'lesson_review');
    script.textContent = '(' + f.toString() + ')(jQuery)';
    document.head.appendChild(script);
}
inject(f);

function f($) {
    function th23DuolingoProgress() {
        if($('#app').hasClass('home') || $('#app').hasClass('comment better-comment')) {
            if(!$('.sidebar-progress-main').length) {
                var th23LanguageData = window.duo.user.attributes.language_data[window.duo.user.attributes.learning_language];
                $('.inner').before('<div class="box-colored bg-white"><h2>Próximo Nível</h2><div class="sidebar-progress-main"><div title="' +  th23LanguageData.level_percent + '% concluído, ' + th23LanguageData.points + 'XP no total' + '" data-toggle="tooltip" class="language-progress-bar-small"><div class="padder"><div style="width: ' + th23LanguageData.level_percent + '%; max-width: 100%;" class="bar"></div></div><span class="level level-current">' + th23LanguageData.level + '</span><span class="level level-next">' + th23LanguageData.next_level + '</span></div><ul class="sidebar-stats" style="font-size: 15px"><li>Faltam <strong>' + th23LanguageData.level_left + 'XP</strong> para o próximo nível</li></ul></div></div>');
            }
        }
    }
    $(document).ready(function() {
        th23DuolingoProgress();
    });
    $(document).ajaxComplete(function() {
        th23DuolingoProgress();
    });
}