With this message I'd like to announce that David Planella and Jordi Mallach have been working on completing and correcting Mailman's Catalan translation for some while, and this work was very recently accepted in the upcoming 2.1.11 release.
Due to this release being imminent when we contacted Mark Sapiro, we did not have time to complete the first review pass, but we plan to continue to work on improving Catalan support in Mailman via a bzr branch in Launchpad for Mailman 2.2 and 3.0.
We are in the process of setting up a Wiki page at Softcatalà's homepage with information on how to contribute, coordination mailing list info and so on.
I've updated the internationalisation page to reflect the changes to the Catalan Mailman team. David and I would like to thank Robert and the other contributors who helped kickstart this translation years ago, and we'd be delighted to be able to have them participate in the new list if they wish. You're more than welcome!