I have a properties file for localization:
foo=Bar title=Widget Application
This is tied in as a resource-bundle in the face
resource-bundle
Here's an example on how to do this: http://www.laliluna.de/articles/javaserver-faces-message-resource-bundle-tutorial.html
You want to have a look at the ResourceBundle.getBundle() part.
ResourceBundle.getBundle()
Greetings, Lars