[рони]

madeas,
заменить полностью на это

(function() {
    var langSave = localStorage.getItem("lang") || "en",
        title = {};
    ["en", "ru"].forEach(function(lang) {
        var elem = document.getElementById("title-" + lang);
        title[lang] = elem.getAttribute("content");
        elem = document.getElementById("switcher-" + lang);
        elem.addEventListener("click", function() {
            document.body.className = lang;
            document.title = title[lang];
            localStorage.setItem("lang", lang)
        });
        langSave == lang && elem.click()
    })
})();