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    The keys available are:

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    - ``language_aliases``
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    - ``script_aliases``
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        [u'E d. – ', u'E d.M.']

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    >>> default_locale('LC_MESSAGES')
    'fr_FR'

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    >>> default_locale('LC_MESSAGES')
    'en_US_POSIX'

    The following fallbacks to the variable are always considered:

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    'de'

    Case is ignored by the algorithm, the result uses the case of the preferred
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    'de_DE'

    By default, some web browsers unfortunately do not include the territory
    in the locale identifier for many locales, and some don't even allow the
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    locale identifiers in your web-application, they would not normally match
    the language-only locale sent by such browsers. To workaround that, this
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    'ja_JP'

    Some browsers even use an incorrect or outdated language code, such as "no"
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    'nb_NO'

    You can override this default mapping by passing a different `aliases`
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    ('zh', 'CN', 'Hans', None)

    The default component separator is "_", but a different separator can be
    specified using the `sep` parameter:

    >>> parse_locale('zh-CN', sep='-')
    ('zh', 'CN', None, None)

    If the identifier cannot be parsed into a locale, a `ValueError` exception
    is raised:

    >>> parse_locale('not_a_LOCALE_String')
    Traceback (most recent call last):
      ...
    ValueError: 'not_a_LOCALE_String' is not a valid locale identifier

    Encoding information and locale modifiers are removed from the identifier:

    >>> parse_locale('it_IT@euro')
    ('it', 'IT', None, None)
    >>> parse_locale('en_US.UTF-8')
    ('en', 'US', None, None)
    >>> parse_locale('de_DE.iso885915@euro')
    ('de', 'DE', None, None)

    See :rfc:`4646` for more information.

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    >>> get_locale_identifier(('de', 'DE', None, '1999'))
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    .. versionadded:: 1.0

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