Djedefre

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* Fixed login validation

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* Fixed sending email after activation
* Fix user deletion serializer and permission class

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* Fixed a registration bug when ``USER_CREATE_PASSWORD_RETYPE`` is set to ``True``.

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* Drop support for Python<3.5
* Drop support for djangorestframework<3.10
* Drop legacy routes
* Reworked permissions logic and default classes (see :ref:`View Permission Settings<view-permission-settings>`)
* Add ``CONSTANTS`` option to settings (mrouhi13)
* Remove deprecated ``CurrentUserSerializer``
* Remove deprecated ``settings.get()`` method

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* Add LOGIN_FIELD setting
* Add CONSTANTS option to settings (mrouhi13)
* Add USER_CREATE_PASSWORD_RETYPE option (Chadys)
* Allow using custom email field (Chadys)
* Remove non_field_error from base endpoints (Chadys)
* Other small fixes

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* Added Russian translation (ozeranskiy)
* Added French translation (Chadys)
* Fix superfluous translation string (Chadys)
* Prevent non-staff users from getting other users' data (hawi74)
* Fix tests for Python 2.7
* Fix some problems in documentation

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