2008.01.28 17:24:49 Missing resource for key: gateway.xmpp.connectionclosed in locale cs_CZ

2008.01.28 17:24:49 Missing resource for key: gateway.xmpp.connectionclosed in locale cs_CZ

One more item in my logs. Openfire 3.3.4 on Fedora/Rawhide

Is there some HOWTO on how to help in translating efforts? I had hard time to understand even in which encoding the .properties files is created (is it UCS-2)?