Detect Spanish Language and Redirect

detect-spanish-redirect.js

(function () {
  //https://github.com/maxogden/browser-locale/blob/master/index.js
  var browserLocale = function () {
    var lang;
    if (navigator.languages && navigator.languages.length) {
      // latest versions of Chrome and Firefox set this correctly
      lang = navigator.languages[0];
    } else if (navigator.userLanguage) {
      // IE only
      lang = navigator.userLanguage;
    } else {
      // latest versions of Chrome, Firefox, and Safari set this correctly
      lang = navigator.language;
    }
    return lang;
  };
  document.addEventListener("DOMContentLoaded", function (event) {
    var lang = browserLocale().slice(0, 2);
    // redirect if not the right locale
    if (lang === "es" && !location.search.match(/locale=en/i)) {
      window.location = "/es";
    }
  });
})();