There were a report about browsers that do not send the
HTTP_ACCEPT_LANGUAGE header. If a roundup tracker is
configured to use the browser language preference it
fails when accessed by those browsers.

Traceback (most recent call last):
 File
"/usr/lib/python2.4/site-packages/roundup/cgi/client.py",
line 237, in inner_main
   self.determine_language()
 File
"/usr/lib/python2.4/site-packages/roundup/cgi/client.py",
line 414, in determine_language
   hal = self.env['HTTP_ACCEPT_LANGUAGE']
KeyError: 'HTTP_ACCEPT_LANGUAGE'