[Mailman-Users] Wrong language sent to subscribers

[Rubeno Fernández]

Hello all,
I'm using Mailman 2.1.20 on Ubuntu 16, which I installed from their 
repositories; Python is 2.7. I've set up DEFAULT_SERVER_LANGUAGE  to 'ca' in 
my /etc/mailman/mm_cfg.py file. All the language files can be found at /usr/
share/mailman/ca.
However, subscription confirmation notices and acknowledgements are sent only 
in English. Strangely enough, the subjects are in Catalan, though.
Is this a bug? How can I fix it?

Rubeno