I've just uploaded a "language pack" to SF which should be useful to those of you that cannot sync against CVS. Please see
for details (but note that SF has a delay in making the file visible). This is a tarball containing the latest and greatest README-I18N.en, mailman.pot, templates/en/* and mailman.po for Spanish, French, and Japanese.
I hope you guys find this useful, but please let me know if there's some way I can improve the process.