old_contents: from django.conf import settings
  from django.conf.urls import include, url
  from django.core import urlresolvers
  from django.utils.html import format_html, format_html_join
  from django.utils.translation import ugettext_lazy as _
  from django.contrib.auth.models import Permission
  from django.contrib.contenttypes.models import ContentType
  
  from wagtail.wagtailcore import hooks
  from wagtail.wagtailadmin.menu import MenuItem
  
  from wagtail_embed_videos import admin_urls
  
  
  @hooks.register('register_admin_urls')
  def register_admin_urls():
      return [
          url(r'^embed_videos/', include(admin_urls)),
      ]
  
  
  @hooks.register('construct_main_menu')
  def construct_main_menu(request, menu_items):
      pass
  
  
  class EmbedVideosMenuItem(MenuItem):
      def is_shown(self, request):
          return request.user.has_perm('wagtail_embed_videos.add_video')
  
  @hooks.register('register_admin_menu_item')
  def register_embed_videos_menu_item():
      return EmbedVideosMenuItem(_('Embed Videos'), urlresolvers.reverse('wagtail_embed_videos_index'), classnames='icon icon-media', order=301)
  
  @hooks.register('register_permissions')
  def register_permissions():
      embed_video_content_type = ContentType.objects.get(app_label='wagtail_embed_videos', model='embedvideo')
      embed_video_permissions = Permission.objects.filter(content_type = embed_video_content_type)
      return embed_video_permissions
  
new_contents: from django.conf import settings
  from django.conf.urls import include, url
  from django.core import urlresolvers
  from django.utils.html import format_html, format_html_join
  from django.utils.translation import ugettext_lazy as _
  from django.contrib.auth.models import Permission
  from django.contrib.contenttypes.models import ContentType
  
  from wagtail.wagtailcore import hooks
  from wagtail.wagtailadmin.menu import MenuItem
  
  from wagtail_embed_videos import admin_urls
  
  
  @hooks.register('register_admin_urls')
  def register_admin_urls():
      return [
          url(r'^embed_videos/', include(admin_urls)),
      ]
  
  
  @hooks.register('construct_main_menu')
  def construct_main_menu(request, menu_items):
      pass
  
  
  
  @hooks.register('register_admin_menu_item')
  def register_embed_videos_menu_item():
      return EmbedVideosMenuItem(
          _('Embed Videos'),
          urlresolvers.reverse('wagtail_embed_videos_index'),
          classnames='icon icon-media', order=301)
  
  
  @hooks.register('insert_editor_js')
  def editor_js():
      js_files = [
          'wagtail_embed_videos/js/embed-video-chooser.js',
      ]
      js_includes = format_html_join('\n', '<script src="{0}{1}"></script>', (
          (settings.STATIC_URL, filename) for filename in js_files)
      )
      return js_includes + format_html(
          """
          <script>
              window.chooserUrls.embedVideoChooser = '{0}';
          </script>
          """,
          urlresolvers.reverse('wagtail_embed_videos_chooser')
      )
  
  
  @hooks.register('register_permissions')
  def register_permissions():
      embed_video_content_type = ContentType.objects.get(
          app_label='wagtail_embed_videos', model='embedvideo')
      embed_video_permissions = Permission.objects.filter(
          content_type=embed_video_content_type)
      return embed_video_permissions
  
subject: Update wagtail_hooks.py