[2.2.x] Used extlinks for Django's source code.

Backport of a68c029e22 from master.

docs/ref/contrib/flatpages.txt

@@ -213,11 +213,9 @@ Via the Python API
 
     Flatpages are represented by a standard
     :doc:`Django model </topics/db/models>`,
-    which lives in `django/contrib/flatpages/models.py`_. You can access
+    which lives in :source:`django/contrib/flatpages/models.py`. You can access
     flatpage objects via the :doc:`Django database API </topics/db/queries>`.
 
-.. _django/contrib/flatpages/models.py: https://github.com/django/django/blob/master/django/contrib/flatpages/models.py
-
 .. currentmodule:: django.contrib.flatpages
 
 .. admonition:: Check for duplicate flatpage URLs.

docs/ref/contrib/gis/db-api.txt

@@ -268,8 +268,8 @@ to be in the units of the field.
     in your field definition.
 
 For example, let's say we have a ``SouthTexasCity`` model (from the
-`GeoDjango distance tests`__ ) on a *projected* coordinate system valid for cities
-in southern Texas::
+:source:`GeoDjango distance tests <tests/gis_tests/distapp/models.py>` ) on a
+*projected* coordinate system valid for cities in southern Texas::
 
     from django.contrib.gis.db import models
 
@@ -303,8 +303,6 @@ both. To specify the band index of a raster input on the right hand side, a
 Where the band with index 2 (the third band) of the raster ``rst`` would be
 used for the lookup.
 
-__ https://github.com/django/django/blob/master/tests/gis_tests/distapp/models.py
-
 .. _compatibility-table:
 
 Compatibility Tables

docs/ref/contrib/redirects.txt

@@ -72,10 +72,8 @@ Via the Python API
 .. class:: models.Redirect
 
     Redirects are represented by a standard :doc:`Django model </topics/db/models>`,
-    which lives in `django/contrib/redirects/models.py`_. You can access redirect
-    objects via the :doc:`Django database API </topics/db/queries>`.
-
-.. _django/contrib/redirects/models.py: https://github.com/django/django/blob/master/django/contrib/redirects/models.py
+    which lives in :source:`django/contrib/redirects/models.py`. You can access
+    redirect objects via the :doc:`Django database API </topics/db/queries>`.
 
 Middleware
 ==========

docs/ref/contrib/syndication.txt

@@ -892,7 +892,7 @@ The low-level framework
 
 Behind the scenes, the high-level RSS framework uses a lower-level framework
 for generating feeds' XML. This framework lives in a single module:
-`django/utils/feedgenerator.py`_.
+:source:`django/utils/feedgenerator.py`.
 
 You use this framework on your own, for lower-level feed generation. You can
 also create custom feed generator subclasses for use with the ``feed_type``
@@ -1006,8 +1006,6 @@ For example, to create an Atom 1.0 feed and print it to standard output::
     ...
     </feed>
 
-.. _django/utils/feedgenerator.py: https://github.com/django/django/blob/master/django/utils/feedgenerator.py
-
 .. currentmodule:: django.contrib.syndication
 
 Custom feed generators

docs/ref/django-admin.txt

@@ -1185,10 +1185,9 @@ Generate squashed migration file without Django version and timestamp header.
 Creates a Django app directory structure for the given app name in the current
 directory or the given destination.
 
-By default the directory created contains a ``models.py`` file and other app
-template files. (See the `source`_ for more details.) If only the app
-name is given, the app directory will be created in the current working
-directory.
+By default, :source:`the new directory <django/conf/app_template>` contains a
+``models.py`` file and other app template files. If only the app name is given,
+the app directory will be created in the current working directory.
 
 If the optional destination is provided, Django will use that existing
 directory rather than creating a new one. You can use '.' to denote the current
@@ -1260,8 +1259,6 @@ files is:
     byte-compile invalid ``*.py`` files, template files ending with ``.py-tpl``
     will be renamed to ``.py``.
 
-.. _source: https://github.com/django/django/tree/master/django/conf/app_template/
-
 ``startproject``
 ----------------
 
@@ -1270,9 +1267,9 @@ files is:
 Creates a Django project directory structure for the given project name in
 the current directory or the given destination.
 
-By default, the new directory contains ``manage.py`` and a project package
-(containing a ``settings.py`` and other files). See the `template source`_ for
-details.
+By default, :source:`the new directory <django/conf/project_template>` contains
+``manage.py`` and a project package (containing a ``settings.py`` and other
+files).
 
 If only the project name is given, both the project directory and project
 package will be named ``<projectname>`` and the project directory
@@ -1315,8 +1312,6 @@ The :class:`template context <django.template.Context>` used is:
 Please also see the :ref:`rendering warning <render_warning>` as mentioned
 for :djadmin:`startapp`.
 
-.. _`template source`: https://github.com/django/django/tree/master/django/conf/project_template/
-
 ``test``
 --------
 

docs/ref/settings.txt

@@ -1160,8 +1160,6 @@ requests being returned as "Bad Request (400)".
     The default :file:`settings.py` file created by :djadmin:`django-admin
     startproject <startproject>` sets ``DEBUG = True`` for convenience.
 
-.. _django/views/debug.py: https://github.com/django/django/blob/master/django/views/debug.py
-
 .. setting:: DEBUG_PROPAGATE_EXCEPTIONS
 
 ``DEBUG_PROPAGATE_EXCEPTIONS``
@@ -1825,9 +1823,7 @@ deletes the one.
 Default: A list of all available languages. This list is continually growing
 and including a copy here would inevitably become rapidly out of date. You can
 see the current list of translated languages by looking in
-``django/conf/global_settings.py`` (or view the `online source`_).
-
-.. _online source: https://github.com/django/django/blob/master/django/conf/global_settings.py
+:source:`django/conf/global_settings.py`.
 
 The list is a list of two-tuples in the format
 (:term:`language code<language code>`, ``language name``) -- for example,
@@ -1858,11 +1854,7 @@ Here's a sample settings file::
 
 Default: A list of all language codes from the :setting:`LANGUAGES` setting
 that are written right-to-left. You can see the current list of these languages
-by looking in ``django/conf/global_settings.py`` (or view the `online
-source`_).
-
-.. _online source: https://github.com/django/django/blob/master/django/conf/global_settings.py
-
+by looking in :source:`django/conf/global_settings.py`.
 
 The list contains :term:`language codes<language code>` for languages that are
 written right-to-left.
@@ -1906,9 +1898,7 @@ errors to an email log handler when :setting:`DEBUG` is ``False``. See also
 :ref:`configuring-logging`.
 
 You can see the default logging configuration by looking in
-``django/utils/log.py`` (or view the `online source`__).
-
-__ https://github.com/django/django/blob/master/django/utils/log.py
+:source:`django/utils/log.py`.
 
 .. setting:: LOGGING_CONFIG
 

docs/ref/templates/api.txt

@@ -1026,9 +1026,8 @@ Loader methods
 
 .. admonition:: Building your own
 
-    For examples, `read the source code for Django's built-in loaders`_.
-
-.. _read the source code for Django's built-in loaders: https://github.com/django/django/tree/master/django/template/loaders
+    For examples, read the :source:`source code for Django's built-in loaders
+    <django/template/loaders>`.
 
 .. currentmodule:: django.template.base