how to add icon in tpl file for package installer but it not get in when i install the package in Sugar 13.0 but in Sugar 12.0 it is working fine ?

Hello Everyone, 

I faced an issue in my tpl file for the package installer. When I install the package the icon was not shown but the code was there. I am using the font awesome external link but it not working in Sugar 13. why is it so? please suggest anything regarding that.