[Mailman-i18n] Recode pipermail templates

[Martin von Loewis]

I made a patch

http://sourceforge.net/tracker/index.php?func=detail&aid=634303&group_id=103&atid=300103

which recodes the pipermail HTML templates and gettext messages if the charset
of the page-under-creation is different from the charset of the templates. It uses
HTML character references if the template characters are not supported in the
target character set, so it should work fine if the template charset and the
target charset are both known to Python. If the template charset and the target
charset match, no conversion happens. If the message has no decared charset, but
the templates use a non-ASCII charset, a META tag is now inserted into the page.

HTH,
Martin