Ok then, you will need to reference your specific web configuration putting the french language at the first position.
To do so :
- Edit the file available in JONAS_ROOT/conf/libresourceConfig.properties
- Set the path to your custom libresource-web.xml where you've changed the language order.
- Restart Libresource
The content of the file is available in the subversion documentation.
Regards,
Seb