надо поправить код. Переключатель языков

script.js

<script type="text/javascript">
  var platformLanguage = navigator && (
      navigator.language ||
        navigator.browserLanguage ||
        navigator.systemLanguage ||
        navigator.userLanguage ||
        null ),
    elemsRU, elemsUK, elemsKZ, elemsEN;
  if (platformLanguage.match("ru") && document.getElementsByClassName) {
    elemsRU = document.getElementsByClassName("b-text_lang_ru");
    elemsUK = document.getElementsByClassName("b-text_lang_uk");
    elemsKZ = document.getElementsByClassName("b-text_lang_kz");
    elemsEN = document.getElementsByClassName("b-text_lang_en");
    var l = elemsEN.length;
    while(l--) {
      elemsEN[l].style.display = "none";
    }
    l = elemsRU.length;
    while(l--) {
      elemsRU[l].style.display = "block";
    }
    document.title = "Тех. работы MineVost!";
  }
</script>