<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def flatpage(request, url):
 """ Public interface to the flat page view. Models: `flatpages.flatpages` Templates: Uses the template defined by the ``template_name`` field, or `flatpages/default.html` if template_name is not defined. Context: flatpage `flatpages.flatpages` object """


    if not url.startswith('/'):
        url = '/' + url

    language = request.LANGUAGE_CODE
    language_prefix = '/%s' % language
    language_db_field = language.replace('-', '_')

    if url.startswith(language_prefix):
        url = url[len(language_prefix):]

    kwargs = {
        '{0}__{1}'.format('url_%s' % language_db_field, 'exact'): url,
        '{0}__{1}'.format('sites__id', 'exact'): settings.SITE_ID
    }

    try:
        f = get_object_or_404(FlatPage_i18n, **kwargs)
    except Http404:
        if not url.endswith('/') and settings.APPEND_SLASH:
            url += '/'
            f = get_object_or_404(FlatPage_i18n, **kwargs)
            return HttpResponsePermanentRedirect('%s/' % request.path)
        else:
            raise

    return render_flatpage(request, f)