It’s look like fontawesome fonts are not available.
In the fontawesome.css
the path is ../fonts/fontawesome-webfont.eot
Verify this path, correct it if fonts are another folder.
The css is waiting for this structure
---theme
fonts
fontawesome-webfont.eot
...
css
fontawesome.css
...
But your structure is maybe
--- theme
fontawesome.css
fonts
fontawesome-webfont.eot
...