Render the children of the requested page with the sub_menu
    template.

def sub_menu(request, page_id):
    """Render the children of the requested page with the sub_menu
    template."""
    page = Page.objects.get(id=page_id)
    pages = page.children.all()
    page_languages = settings.PAGE_LANGUAGES
    return render_to_response("admin/basic_cms/page/sub_menu.html", {
        'page': page,
        'pages': pages,
        'page_languages': page_languages,
    }, context_instance=RequestContext(request))