There are some missing MIME decodes for Subject headers.
I found this problem in the following programs
(as the result of searching "%(subject)s" in LC_MESSAGES).
* reject notification mail for held messages
Mailman/ListAdmin.py
* cancel confirmation and cancel result screen for held messages
Mailman/Cgi/confirm.py
* archived HTML for forwarded mails in the style of message/rfc822 attachment
Mailman/Handlers/Scrubber.py
A patch for Mailman 2.1.9 is attached.
Original discussion in the ML mmjp-users (Japanese Mailman users) is:
http://mm.tkikuchi.net/pipermail/mmjp-users/2008-January/002256.html
patch for Mailman 2.1.9