Since the release of Mailman 2.1.16 last month, there have been some i18n updates, a new feature affecting which headers are kept in posts to anonymous lists and a few bug fixes.
One of these bugs was introduced in 2.1.16 and is fairly serious although it only affects lists with defined topics. See https://launchpad.net/bugs/1251495. For this reason, I plan to release Mailman 2.1.17 in about a week. If there are any i18n changes or other things that should go in 2.1.17, please get them to me before next weekend.