Email subject template instead of hardcoded string #77
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Instead of a direct setting, the email subject can now be set using a template.
This is heavily inspired and pretty much copied from the way Django is rendering the email subject for its password reset links.
See https://github.com/django/django/blob/main/django/contrib/auth/templates/registration/password_reset_subject.txt
See https://docs.djangoproject.com/en/4.2/topics/auth/default/#django.contrib.auth.views.PasswordResetView.subject_template_name
This approach also allows for a i18n email subject, which is not really possible otherwise (gettext translations in settings will likely break email services).