Boilerplate browser locale detector

get-browser-locale.js

function getLocale() {
  var lang;

  if (navigator.languages) {
    // chrome does not currently set navigator.language correctly https://code.google.com/p/chromium/issues/detail?id=101138
    // but it does set the first element of navigator.languages correctly
    lang = navigator.languages[0];
  } else if (navigator.userLanguage) {
    // IE only
    lang = navigator.userLanguage;
  } else {
    // as of this writing the latest version of firefox + safari set this correctly
    lang = navigator.language;
  }

  return lang;
}