I committed updates to the Mailman catalogs for 2.1.5. You should be able to CVS update and update your translations. I probably won't have time to release 2.1.5 until after Pycon so you have some time to update.
Don't forget: you definitely want to be working on the Release_2_1-maint branch. In your CVS checkout, be sure to do:
% cvs -q up -Pd -r Release_2_1-maint
to get the latest copies.