[Bug 1643210] [NEW] 'from_is_list' does not RFC2047 encode correctly when translation contains non-ascii char

[Yasuhito FUTATSUKI at POEM]

Public bug reported:

If from_is_list feature is used, From: header's `realname' field is composed by original realname
and translation of '%(realname)s via %(lrn)s' which may contain non-ascii character.

The realname field is encoded before compose if nessesary, but translation part is not.
So From header may contain raw non-ascii character.

To fix this, do RFC 2047 encode after compose.

(There is another bug..., if servers language setting and mail list preferred language is differ,
translation has taken from servers language, not from mail list one. Attached patch contains
fix of it)

** Affects: mailman
     Importance: Undecided
         Status: New

** Attachment added: "CookHeaders.py.diff.txt"
   https://bugs.launchpad.net/bugs/1643210/+attachment/4780159/+files/CookHeaders.py.diff.txt

** Branch linked: lp:mailman/2.1

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https://bugs.launchpad.net/bugs/1643210

Title:
  'from_is_list' does not RFC2047 encode correctly when translation
  contains non-ascii char

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