Django-translated-fields

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- Reused Django's own machinery for displaying data in the changelist
instead of playing catch-up ourselves.
- Moved the ``list_display_column`` helper functionality into the
``TranslatedFieldAdmin`` class and made its application automatic as
long as you're not overriding ``get_list_display``.

~~~~~~~~~~~~~~~~~~~

- Added an example and an explanation how to best customize the
administration interface when using django-translated-fields.
- Added Django 2.1 to the Travis CI test matrix (no changes were
necessary for compatibility).
- Made pull requests not following the black coding style fail.
- Added the "production/stable" development status trove identifier.
- Dropped Python 3.4 from the build matrix.
- Added a ``list_display_column`` helper for showing language codes in
column titles.

~~~~~~~~~~~~~~~~~~~

- Replaced the ``verbose_name_with_language`` option and the
``verbose_name`` mangling it does with ``TranslatedFieldAdmin`` which
offers the same functionality, but restricted to the admin interface.

~~~~~~~~~~~~~~~~~~~

- Switched the preferred quote to ``"`` and started using `black
<https://pypi.org/project/black/>`_ to automatically format Python
code.
- Added Python 3.4 to the test matrix.
- Made documentation better.

~~~~~~~~~~~~~~~~~~~

- Added documentation.
- Converted the ``TranslatedField`` into a descriptor, and made
available a few useful fields on the descriptor instance.
- Made it possible to set the value of the current language's field, and
added another keyword argument for replacing the default
``attrsetter``.
- Made ``to_attribute`` fall back to the current language.
- Added exports for ``to_attribute``, ``translated_attrgetter`` and
``translated_attrsetter`` to ``translated_fields``.
- Added an ``attrgetter`` argument to ``translated_attributes``.

~~~~~~~~~~~~~~~~~~~

- By default the language is appended to the ``verbose_name`` of
fields created by ``TranslatedField``. Added the
``verbose_name_with_language=True`` parameter to ``TranslatedField``
which allows skipping this behavior.
- Added a ``languages`` keyword argument to ``TranslatedField`` to allow
specifying a different set of language-specific fields than the default of
the ``settings.LANGUAGES`` setting.
- Added a ``attrgetter`` keyword argument to ``TranslatedField`` to
replace the default implementation of language-specific attribute
getting.
- Added the possibility to override field keyword arguments for specific
languages, e.g. to only make a single language field mandatory and
implement your own fallback via ``attrgetter``.