Description of problem:
If Mailman has a list that's language is set to finnish, it fails to archive the messages on that list with python traceback.

Version-Release number of selected component (if applicable):
mailman-2.1.5.1-34.rhel4.6

How reproducible:
Always.

Steps to Reproduce:
1. Create a mailing list.
2. Switch on finnish language and archiving. 
3. Send a message to the list and run /usr/lib/mailman/bin/arch <list>
  
Actual results:
Jun 12 17:47:40 2009 (19662) SHUNTING: 1196259196.5090239+bd10bea939da93223841a599d3ee702ea96d6e61
Jun 12 17:48:06 2009 (19662) Uncaught runner exception: unsupported format character '�' (0xffffffe4) at index 16
Jun 12 17:48:06 2009 (19662) Traceback (most recent call last):
  File "/usr/lib/mailman/Mailman/Queue/Runner.py", line 111, in _oneloop
    self._onefile(msg, msgdata)
  File "/usr/lib/mailman/Mailman/Queue/Runner.py", line 167, in _onefile
    keepqueued = self._dispose(mlist, msg, msgdata)
  File "/usr/lib/mailman/Mailman/Queue/ArchRunner.py", line 73, in _dispose
    mlist.ArchiveMail(msg)
  File "/usr/lib/mailman/Mailman/Archiver/Archiver.py", line 216, in ArchiveMail
    h.close()
  File "/usr/lib/mailman/Mailman/Archiver/pipermail.py", line 313, in close
    self.write_TOC()
  File "/usr/lib/mailman/Mailman/Archiver/HyperArch.py", line 1053, in write_TOC
    toc.write(self.html_TOC())
  File "/usr/lib/mailman/Mailman/Archiver/HyperArch.py", line 740, in html_TOC
    accum.append(self.html_TOC_entry(a))
  File "/usr/lib/mailman/Mailman/Archiver/HyperArch.py", line 763, in html_TOC_entry
    templ = '<td><A href="%(url)s">[ ' + _('Gzip\'d Text%(sz)s') \
  File "/usr/lib/mailman/Mailman/i18n.py", line 89, in _
    return tns % dict
ValueError: unsupported format character '�' (0xffffffe4) at index 16


More annyoing sidefeature is that messages wont get delivered 
always and get 'SHUNNED' to /var/spool/mailman/shunt and must 
be manually delivered with unshunt command.



Expected results:
Messages not being shunted and archives working.

Additional info:
Known issue https://bugs.launchpad.net/mailman/+bug/266122

#mailman@freenode:
[15:25] <Piet> i use a more recent version and haven't seen this bug in two years