1. I’ve checked your site and looks like the code works fine http://prntscr.com/i0orvg and http://prntscr.com/i0os0e
Do not forget to clear cache before checking.
2. I’ve uploaded missing fontawesome fonts, so now all icons should work fine.
Where you want to use fa-etsy
icon? make sure that you do it correctly http://fontawesome.io/icon/etsy/
Regards