old_contents: from django.contrib import admin
  from django.contrib.sites.models import Site
  from django.contrib.sites.admin import SiteAdmin
  
  
  SiteAdmin.list_display += ('fb_page_url', 'page_title', 'page_subtitle', 'billboard_image',)
  
  
new_contents: from django.contrib import admin
  from django.contrib.sites.models import Site
  from django.contrib.sites.admin import SiteAdmin
  from django.conf import settings
  from django.contrib.flatpages.models import FlatPage
  
  from django.contrib.flatpages.admin import FlatPageAdmin, FlatpageForm
  
  class MyFlatPageAdmin(FlatPageAdmin):
  
      class Media:
          if settings.HEROKU is True:
              js = ('grappelli/tinymce/jscripts/tiny_mce/tiny_mce.js',
                  'grappelli/tinymce_setup/tinymce_setup.js',)
          else:
              js = ('/static/grappelli/tinymce/jscripts/tiny_mce/tiny_mce.js',
                  '/static/grappelli/tinymce_setup/tinymce_setup.js',)
  
  
  admin.site.unregister(FlatPage)
  admin.site.register(FlatPage, MyFlatPageAdmin)
  
  
  SiteAdmin.list_display += ('fb_page_url', 'page_title', 'page_subtitle', 'billboard_image',)
  
  
subject: fix flatpage content editor