I have merged new mailman.pot with my previos translation. It says, there are 300 untranslated messages, but when I look on them, I see messages like:
Class for internally crafted messages.
Return true if named header field matches a regexp in the\n bounce_matching_header list variable.\n \n Returns constraint line which matches or empty string for no\n matches.\n
Return a list of triples [(field name, regex, line), ...].
This are internaly documentating comments and I think, they shouldn't be translated. The mailman.pot is probably bad generated.
I have also about 600 translated messages and I think that czech traslation is also almost complete.