Public bug reported:
See https://lists.uferwerk.org/cgi-bin/mailman/listinfo/
I have tried to manually enforce UTF-8 by adding
```python
add_language('en', 'English (USA)', 'utf-8', 'ltr')
add_language('de', 'Deutsch', 'utf-8', 'ltr')
```
We see this misbehaviour since we migrated mailman from one server
running Ubuntu 14.4 with mailman 1:2.1.14-3ubuntu0.4 to another server
running 16.10 with mailman 1:2.1.22-1ubuntu0.1
On the old server, it worked just fine without any additional tweaking
and on the new server, not tweaking seems to change anything at all.
In the mailman error log I see recurring error messages of the sort:
```
Apr 24 15:10:19 2017 (898) list: mitglieder: can't decode "Liste f�r
Mitglieder der Uferwerk e.G." as utf-8
Apr 24 15:10:19 2017 (901) list: mitglieder: can't decode "Liste f�r
Mitglieder der Uferwerk e.G." as utf-8
Apr 24 15:10:20 2017 (901) list: mitglieder: can't decode "Liste f�r
Mitglieder der Uferwerk e.G." as utf-8
```
I am not sure why these descriptions were suddenly in latin-1 but I manually
converted them to utf-8 now, restarted mailman, and the situation remains
unchanged: Both the overview page and the mail notifications are in latin-1
while the headers declare that they are in utf-8, which results in broken
rendering of the text
** Affects: mailman
Importance: Undecided
Status: New
--
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https://bugs.launchpad.net/bugs/1685945
Title:
Mismatch between declared and actual encoding in mail notifications
and web pages
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