/etc/mailman/mm_cfg.py is currently not considered a conffile of mailman.
That is the reason it is overwritten on an update instead of getting the usual 
"you had differences do you want the maintainers content, Y/N/show diff".

But currently:
# cat /var/lib/dpkg/info/mailman.conffiles
/etc/cron.d/mailman
/etc/init.d/mailman
/etc/logrotate.d/mailman
/etc/mailman/apache.conf

OTOH this doesn't seem a normal file - there is some special handling for 
language.
This is doen via debconf - so when you first installed you were asked what the 
default should be and this is generated into this file.

 92     if [ -e /etc/mailman/mm_cfg.py ]; then                                  
     
 93         db_get mailman/default_server_language || true                      
     
 94         if [ -n "$RET" ]; then                                              
     
 95             default_server_language="$(echo $RET | sed -r 's/ 
\([^\)]*\)//g')"   
 96             sed -e 
s/DEFAULT_SERVER_LANGUAGE.*=.*\'..\'/DEFAULT_SERVER_LANGUAGE\ =\ 
\'${default_server_language}\'
 97             mv -f ${mm_etc}/mm_cfg.py.$$ ${mm_etc}/mm_cfg.py                
     
 98         fi                                                                  
     
 99     fi  

That code seems odd to me, but I'm not a debconf expert anyway.
SO in general this file seems to be handled "special" in the postinst.

I see it will
1. do the check above to set language from debconf
2. place the file if it does not exist (cp from 
/usr/lib/mailman/Mailman/mm_cfg.py.dist)
   IMHO that should be before above check
3. if mm_defaults is still in the file configure it

While I think #2 and #1 would need some fixes (separate issue IMHO) I wonder 
where your problem might come from.
Maybe just that you need to set the debconf.
What does:
$ debconf-show mailman
show you for mailman/site_languages?

If it is not zh_TW you might set it with:
$ echo "set mailman/default_server_language zh_TW" | debconf-communicate
After that does an install still clobber it for you?

** Changed in: mailman (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1748386

Title:
  upgrading mailman changed DEFAULT_SERVER_LANGUAGE from "en" to "zh_TW"

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