[rules-users] using property files in knowlegde base

Hi all! First of all I have to say that I'm quite new to Drools, so please be patient with me =) My question regards the property files which can be assigned to a package in the knowledge base. I'd like to store property files for internationalization in the knowledge base and work with them in my process definition. So far I added the needed files via the guvnor to my package but how I'm supposed to load them in the process definition? I already had a look at the documentations and api-javadoc but couldn't find anything to answer my question. Thanks in advance for your help. Kilian