Made description of LANGUAGE_CODE setting more clear.

Default: ``'en-us'``

A string representing the language code for this installation. This should be

in standard :term:`language format<language code>`. For example, U.S. English

A string representing the language code for this installation. This should be in

standard :term:`language ID format <language code>`. For example, U.S.  English

is ``"en-us"``. See also the `list of language identifiers`_ and

:doc:`/topics/i18n/index`.

:setting:`USE_I18N` must be active to this setting to have any effect.

it serves two purposes:

* If the locale middleware isn't in use, it decides which translation is served

  to all users.

* If the locale middleware is active, it provides the fallback translation when

  no translation exist for a given literal to the user preferred language.

See :ref:`how-django-discovers-language-preference` for more details.

.. _list of language identifiers: http://www.i18nguy.com/unicode/language-identifiers.html

.. setting:: LANGUAGE_COOKIE_NAME

To set an installation-wide language preference, set :setting:`LANGUAGE_CODE`.

Django uses this language as the default translation -- the final attempt if no

other translator finds a translation.

better matching translation is found by one of the methods employed by the

locale middleware (see below).

If all you want to do is run Django with your native language, and a language

file is available for it, all you need to do is set :setting:`LANGUAGE_CODE`.

If all you want to do is run Django with your native language all you need to do

is set :setting:`LANGUAGE_CODE` and make sure the corresponding :term:`message

files <message file>` and their compiled versions (``.mo``) exist.

If you want to let each individual user specify which language he or she

prefers, use ``LocaleMiddleware``. ``LocaleMiddleware`` enables language

selection based on data from the request. It customizes content for each user.

prefers, the you also need to use use the ``LocaleMiddleware``.

``LocaleMiddleware`` enables language selection based on data from the request.

It customizes content for each user.

To use ``LocaleMiddleware``, add ``'django.middleware.locale.LocaleMiddleware'``

to your :setting:`MIDDLEWARE_CLASSES` setting. Because middleware order