=== modified file 'Mailman/Handlers/CookHeaders.py'
--- Mailman/Handlers/CookHeaders.py	2016-03-02 09:57:16 +0000
+++ Mailman/Handlers/CookHeaders.py	2016-11-19 16:33:40 +0000
@@ -31,7 +31,7 @@
 
 from Mailman import mm_cfg
 from Mailman import Utils
-from Mailman.i18n import _
+from Mailman.i18n import get_translation, set_translation, set_language, _ 
 from Mailman.Logging.Syslog import syslog
 
 CONTINUATION = ',\n '
@@ -91,6 +91,7 @@
 
 
 def process(mlist, msg, msgdata):
+    cset = Utils.GetCharSet(mlist.preferred_language)
     # Set the "X-Ack: no" header if noack flag is set.
     if msgdata.get('noack'):
         change_header('X-Ack', 'no', mlist, msg, msgdata)
@@ -154,11 +155,28 @@
                 realname = email
         # Remove domain from realname if it looks like an email address
         realname = re.sub(r'@([^ .]+\.)+[^ .]+$', '---', realname)
-        # RFC 2047 encode realname if necessary.
-        realname = str(uheader(mlist, realname))
+        realname, mcset = ch_oneline(realname)
         lrn = mlist.real_name
+        # Now let's temporarily set the language context to that which the
+        # list admin is expecting.
+        otranslation = get_translation()
+        set_language(mlist.preferred_language)
+        try:
+            if mcset != cset:
+                realname = realname.decode(mcset).encode(cset)
+                mcset = cset
+            lrn = mlist.real_name
+            repl_realname = _('%(realname)s via %(lrn)s')
+        except UnicodeError:
+            syslog('error', 'list: %s: fail to convert "%s" as %s',
+               mlist.internal_name(), realname, cset)
+            repl_realname = '%s via %s' % (realname, lrn)
+        finally:
+            set_translation(otranslation)
+        # RFC 2047 encode repl_realname if necessary.
+        repl_realname = str(Header(repl_realname, mcset, None, None, ' '))
         change_header('From',
-                      formataddr((_('%(realname)s via %(lrn)s'),
+                      formataddr((repl_realname,
                                  mlist.GetListEmail())),
                       mlist, msg, msgdata)
     else:
@@ -296,7 +314,6 @@
         return
     # This will act like an email address for purposes of formataddr()
     listid = '%s.%s' % (mlist.internal_name(), mlist.host_name)
-    cset = Utils.GetCharSet(mlist.preferred_language)
     if mlist.description:
         # Don't wrap the header since here we just want to get it properly RFC
         # 2047 encoded.
@@ -400,7 +417,10 @@
     # At this point, subject may become null if someone post mail with
     # subject: [subject prefix]
     if subject.strip() == '':
+        otranslation = get_translation()
+        set_language(mlist.preferred_language)
         subject = _('(no subject)')
+        set_translation(otranslation)
         cset = Utils.GetCharSet(mlist.preferred_language)
         subject = unicode(subject, cset)
     # and substitute %d in prefix with post_id