Django-private-storage

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* Fixed compatibility for django-storages
* Clean Code

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* Fixed compatibility for Django 4.1, 4.2

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* Added Django 4 support.
* Added minio storage support.

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* Added PrivateImageField.
* Added French locale.
* Fixed support for django-storages > 1.10.
* Fixed Django 4 deprecation warnings
* Dropped Python 2.7/3.4/3.5 support.
* Dropped Django 1.8/1.9/1.10/1.11 support.

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* Fixed Django 3.0 compatibility.

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* Make sure custom ``403.html`` template is used when access is denied.
* Fixed accessing files when the ``User-Agent`` header is not set.