Thank you for this localization effort. We will look into incorporating it to the Portal source code. Note that some new entries have been added to property files since 2.7.2 so you might have to update your work for 2.7.3...
I got the source code from http://anonsvn.jboss.org/repos/portal/branches/JBoss_Portal_Branch_2_7. Not sure whether this is 2.7.3.
If yes, I have completed it.
The properties files are under:
The xml files are under: