Broken stacked icons on Quicksilver's footer

Quicksilver uses fa-lg alongside fa-stack to size and stack the icons. However, Font Awesome does not support fa-lg in combination with fa-stack since stacks have their own sizing classes (e.g. fa-stack-1x fa-stack-2x). Using these two together does give the proper icon size, however the line-heights are wrong.

The fix would be to remove the fa-lg here.