By the way I don’t have the issue with my test environment : test.lentrepotdelafete.com is it because I am not using a subdomain http://www.test.lentrepotdelafete.com ?
Sorry, I found the solution, I added this to my .htaccess :
# Allow font assets to be used across domains and subdomains
<FilesMatch “\.(ttf|otf|eot|woff|woff2)$”>
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin “*”
</IfModule>
</FilesMatch>
This problem is caused by the server and you need to consult with your host about this problem. If the solution works then you can keep it or ask your host about some better one.