This text can include Python format strings which are resolved against list attributes. The list of substitutions allowed are:
real_name - The `pretty' name of the list; usually
    the list name with capitalization.
    list_name - The name by which the list is
    identified in URLs, where case is significant.  (For backwards
    compability, _internal_name is equivalent.)
    host_name - The fully qualified domain name
    that the list server runs on.
    web_page_url - The base URL for Mailman.  This
    can be appended with,
    e.g. listinfo/%(internal_name)s to yield the
    listinfo page for the mailing list.
    description - The brief description of the
    mailing list.
    info - The full description of the mailing
    list.
    cgiext - The extension added to CGI scripts.