I was able to change the mfn-icons url in the header from theme-head.php and I copied the whole fonts folder into another empty server and linked to that url. I can now reach the mfn-icons.css file by directly typing that address in the browser but the theme still doesn't show the icons.
Ok, so it's clear now. Icons does not work because CORS library does not work on your server side what you can see on http://pasteboard.co/1wPZZrCn.png
In this case you must contact with server admin. More information about this library you can read on http://pasteboard.co/1wPZZrCn.png
Comments
In this case you must contact with server admin. More information about this library you can read on http://pasteboard.co/1wPZZrCn.png
Thanks!