Language detection, normal browser and phonegap.

LanguageDetection.js

var detectLanguage = function(successCB, errorCB) {
  //Phonegap browser detection
  if (navigator.globalization !== null && navigator.globalization !== undefined) {
     navigator.globalization.getPreferredLanguage(
       function (language) { successCB(language); },
        function (error) { errorCB(error); }
      );
    //Normal browser detection
    } else {
      if(window.navigator.language !== null && window.navigator.language !== undefined) {
          successCB(window.navigator.language);
      }
    }
  }