[Bug 1685945] [NEW] Mismatch between declared and actual encoding in mail notifications and web pages

[Johannes Rohr]

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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