Django-user-management

* Add `VerifyUserEmailView` to handle links from registration verification emails.

* Clarify error message when your old and new passwords match, you will need to update translations.
* Add translation for email in `RegistrationSerializer` and `UserSerializerCreate`.

* Swap `request.DATA` (deprecated in DRF v3.0, removed in DRF v3.2) for `request.data`.

* Make token to verify account to expires if `VERIFY_ACCOUNT_EXPIRY` is set to
a value in seconds.

Notes

* If `VERIFY_ACCOUNT_EXPIRY` is not set the token will never expire.

* Make `RegistrationSerializer` and `EmailSerializerBase` fields a tuple.

Notes

`RegistrationSerializer` or `EmailSerializerBase` subclasses adding new fields
with a `list` will generate a `TypeError`:


class CustomRegistration(RegistrationSerializer):
class Meta(RegistrationSerializer.Meta):
fields = RegistrationSerializer.Meta.fields + ['custom_field']

TypeError: can only concatenate tuple (not "list") to tuple`


To fix the previous error we use a tuple instead:


class CustomRegistration(RegistrationSerializer):
class Meta(RegistrationSerializer.Meta):
fields = RegistrationSerializer.Meta.fields + ('custom_field',)

* Ensure new and old passwords differ when changing password.