https://blog.toright.com/posts/3681/sencha-touch-%e9%80%8f%e9%81%8e%e6%95%b4%e5%90%88-font-awesome-%e4%be%86%e6%93%b4%e5%85%85%e5%9c%96%e7%a4%ba
Sencha Touch 透過整合 Font Awesome 來擴充圖示