.glyphicon class changes font-family on element 

why its there now only ".glyphicon" and not ".glyphicon:before" like before? Its problem when i want to add icon to concrete element using only css, because for example i want to add icon to the anchor element 

<a href="#" class="glyphicon glyphicon-thumbs-up">link</a>

and this will change font-family for inside text "link" too and, which is not correct