title: Issue with i118next initialization
body: <p>I am using the i18next script in my jQuery Mobile page in Cordova/PhoneGap app.</p>
  
  <p>I have the below scripts included in the bottom of HTML page.</p>
  
  <pre><code>&lt;script src="js/jquery-1.8.3.min.js"&gt;&lt;/script&gt;               
  &lt;script src="js/jquery.mobile-1.3.2.min.js"&gt;&lt;/script&gt;   
  &lt;script src="js/i18next-1.7.1.min.js"&gt;&lt;/script&gt;         
  &lt;script src="js/main.js"&gt;&lt;/script&gt;  
  </code></pre>
  
  <p>The main.js file has some logic which will be included in all pages of my app. </p>
  
  <p><strong>main.js</strong> File:</p>
  
  <pre><code>function doBootstrap() {
      i18n.init({lng: "en", fallbackLng: 'en'});
  
      var header = "some tags";
      header += '&lt;h1&gt;' + i18n.t("app.title") + '&lt;/h1&gt;';
  
      // other functions
  }
  </code></pre>
  
  <p>I will be using the script to get the translated values across the page in different sections</p>
  
  <p>The above function is called in Cordova devideready function which is placed beow the above mentioned  includes. .</p>
  
  <pre><code>document.addEventListener("deviceready", onDeviceReady, true);
  
  function onDeviceReady() {
      doBootstrap();
  }
  </code></pre>
  
  <p>With all the above setup I get the below error in i18next-1.7.1.min.js file.</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'defaultValue' of undefined 
  </code></pre>
  
  <p>The .json file is present in \locales\en\translation.json and the content of it is below. No error or warning is displayed in console.</p>
  
  <pre><code>{
     "app": {
       "title": "Title"
     }
  }
  </code></pre>
  
  <p>What I am missing with the plugin setup?</p>