Support "Font Awesome 5" make UI much more friendly

Html5 symbol make user experience so much more friendly because of “:grinning::+1:inline icon” really flexible for multi language UI.

but Html5 have its limitation, not only number of icons, but also icons not consistence cross internet browsers.

“Font Awesome 5” support much more cooler icons.

If RS support this css style, its really awesome :grinning:

this feature not really essential, because it make the webapp depending on the 3rd website, it seem must to refering to out side url :smiley: