Font Awesome alert icons

[Ramez]

greetings,
I’m building my first little module which sends a notification to Alert module by

this.sendNotification("SHOW_ALERT", {title: "blah", imageFA: 'bullhorn', message: "blah", timer: 5000});

the problem is any icon in imageFA except bullhorn isn’t shown even with adding the proper

getStyles: function() {
        return ['font-awesome.css'];
},

to my_module.js file so the question is, does alert module fully handle the notification payload (which contains imageFA data) if so looks like there is a problem with the default module?, or something missing has to be configured first in my module??