title: convert highcharts to image for Persian language
body: <p>I tried to save a Highchart as an image like this : <a href="http://jsfiddle.net/willkoehler/1p81fbzs" rel="nofollow noreferrer">http://jsfiddle.net/willkoehler/1p81fbzs</a></p>
  
  <p>but when I change the text or numbers to Persian it does not work! </p>
  
  <p>for example you can change the title like this:</p>
  
  <pre><code>title: {
          text: 'نمونه نمودار'
      },
  </code></pre>
  
  <p>and you can see that does not work. What can I do to solve it?</p>