When installing the mailman package, you got asked which languages you want that site to support. You didn't include Spanish in the list. Use "dpkg-reconfigure mailman" to change the list. All languages supported by a list on the site are forced on, meaning if you turn them off, they are turned back on in your back.
Why are not all templates installed, instead of only a subset? What happens if Mailman adds a template, or modifies one?
which has weird symlinks: /var/lib/mailman/templates -> /etc/mailman
Templates can be changed by the administrator and are thus considered as configuration files and are thus in /etc/, as per Debian policy (and Linux FHS). This guarantees that a package upgrade won't override changes the administrator may have made.
OK. Why are not the templates in /etc/mailman/templates/ ? I find this a bit confusing
That linking may or may not confuse the maintainer scripts of the package, I'm not sure. If you want to play it safe, have your user remove that link and use "dpkg-reconfigure mailman".
I'll tell her if she comes back on the irc channel :)
Thanks for the explanations
-- Fil