I will soon be packaging and announcing the first release candidate for Mailman 2.1.19. The details of changes since the 2.1.18-1 release are in the attached README.
The reason for this heads up is there are many things in this release that have i18n impacts and I want to give as much notice as possible of these changes so that people who are interested in updating templates and the message catalogs for a particular language can hopefully get their changes in in time for the final release. If you are interested in helping with this, whether or not you are a current translator, see http://wiki.list.org/x/MQ.
Many of the changes have to do with the fact that for several years, I have been maintaining the officially defunct 2.2 branch in parallel with 2.1. This branch had a number of features and fixes that had never been put in the 2.1 branch because of their i18n impacts. I have now decided to backport all those changes and finally abandon the 2.2 branch. These changes affect the message catalog and add a new adminaddrchgack.txt template and make a minor change to the admindbdetails.html template.
I have also implemented new features that weren't in the 2.2 branch, but add new strings to the web admin UI.
See the attached README for more on what all these changes are.
The mailman.pot message template has been updated with all these changes and msgmerged with the various mailman.po files. All of this can be retrieved from the bazaar branch at https://code.launchpad.net/~mailman-coders/mailman/2.1 at rev. 1520 (or later).