Fixed #21675 -- Added app configs for contrib apps.

django/contrib/admin/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class AdminConfig(AppConfig):
+    name = 'django.contrib.admin'
+    verbose_name = _("administration")

django/contrib/admindocs/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class AdminDocsConfig(AppConfig):
+    name = 'django.contrib.admindocs'
+    verbose_name = _("administrative documentation")

django/contrib/auth/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class AuthConfig(AppConfig):
+    name = 'django.contrib.auth'
+    verbose_name = _("authentication and authorization")

django/contrib/comments/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class CommentsConfig(AppConfig):
+    name = 'django.contrib.comments'
+    verbose_name = _("comments")

django/contrib/contenttypes/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class ContentTypesConfig(AppConfig):
+    name = 'django.contrib.contenttypes'
+    verbose_name = _("content types")

django/contrib/flatpages/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class FlatPagesConfig(AppConfig):
+    name = 'django.contrib.flatpages'
+    verbose_name = _("flat pages")

django/contrib/formtools/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class FormToolsConfig(AppConfig):
+    name = 'django.contrib.formtools'
+    verbose_name = _("form tools")

django/contrib/gis/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class GISConfig(AppConfig):
+    name = 'django.contrib.gis'
+    verbose_name = _("GIS")

django/contrib/humanize/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class HumanizeConfig(AppConfig):
+    name = 'django.contrib.humanize'
+    verbose_name = _("humanize")

django/contrib/messages/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class MessagesConfig(AppConfig):
+    name = 'django.contrib.messages'
+    verbose_name = _("messages")

django/contrib/redirects/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class RedirectsConfig(AppConfig):
+    name = 'django.contrib.redirects'
+    verbose_name = _("redirects")

django/contrib/sessions/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class SessionsConfig(AppConfig):
+    name = 'django.contrib.sessions'
+    verbose_name = _("sessions")

django/contrib/sitemaps/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class SiteMapsConfig(AppConfig):
+    name = 'django.contrib.sitemaps'
+    verbose_name = _("site maps")

django/contrib/sites/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class SitesConfig(AppConfig):
+    name = 'django.contrib.sites'
+    verbose_name = _("sites")

django/contrib/staticfiles/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class StaticFilesConfig(AppConfig):
+    name = 'django.contrib.staticfiles'
+    verbose_name = _("static files")

django/contrib/syndication/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class SyndicationConfig(AppConfig):
+    name = 'django.contrib.syndication'
+    verbose_name = _("syndication")

django/contrib/webdesign/apps.py

+from django.apps import AppConfig
+
+from django.utils.translation import ugettext_lazy as _
+
+
+class WebDesignConfig(AppConfig):
+    name = 'django.contrib.webdesign'
+    verbose_name = _("web design")