I18N - new locale support without repackaging of war

My JSF application has support for French and English strings. I have provided French and English resource bundles . In my faces-config.xml file, I have set the <default-locale> to be 'en' and <supported-locale> as 'fr'.

The application is now deployed by a customer who wants to provide support for Spanish.

Is there a way to provide this support without requiring modification of the faces-config.xml file and repackaging of the war file.

Ideally I'd like the customer to simply provide the Spanish resource bundle somewhere on the application server and my application should load that resource bundle.
Restart of the server is not an issue, but it should not require repackaing of the application's war file.

Can this be done in JSF and if yes, how.

thanks,
tsc