Portuguese is already included: http://ps3mediaserver.googlecode.com/svn/trunk/ps3mediaserver/net/pms/messages_pt.properties
to do for brazilian portuguese language file:
1. Download file mentioned before, edit it with a text editor (e.g. notepad++ on Windows), save it with different language-related suffix, e.g. .br for brazil
2. upload your file to http://gussi.is/pms/index.php for syntax check
3. if everything is fine zip the file and upload it here in thread
Best regards, Otmanix



