Font Awesome version 5 changed some icon names, and introduces new prefixes fab, far, and fas.
There is a JavaScript shim that you can use as a "quick fix". It allows you to keep v4 icon names on v5.
The linked page includes details on using that, and a migration guide including a list of icon renames.
Posted by Arne Hartherz to makandra dev (2017-12-22 09:25)