$(function() {
  var SEP_CHAR = "-",
      langCode,
      browserLang =
    (window.navigator.languages && window.navigator.languages[0]) ||
    window.navigator.language ||
    window.navigator.userLanguage ||
    window.navigator.browserLanguage;

  if (browserLang) {
    langCode = browserLang.split(SEP_CHAR)[0];
  } else {
    langCode = "en";
  }

  $.validate({
    modules: "html5",
    lang: langCode
  });