We have released an upgrade of our Core add-on which provides support for Font Awesome icons up to FA 5.10.1 (more than hundred of new icons supported).
Compatibility with FA 5. Due to the changes introduced in FA 5 some icons may not display, you will have to either ask your users to edit them or edit it for them.
As of now, the XF2 version is only compatible with XF 2.1 versions and above.