social icons don't show in update [fix]

Hi, I noticed that social icons don’t show after theme update

Same problem on demo site – no twitter icon, but if in chrome change class to icon-vk it shows vk icon, but twitter, facebook and others still don’t show.

So as I was writing this I made some digging – and now there more icons
icon-twitter now icon-twitter-1 {2,3,xxx}

all icons list in assets/html/core/libs/css/fontello.css

Maybe it will be usefull