Дилян Палаузов authored Feb 02, 2024 and Mark Sapiro committed Feb 02, 2024

So that the returned message, when trying to re-subscribe to a mailing list, is translated.  Currently the answer is:
```
Следват резултатите от твоята команда изпратена по електронна поща.

- Подробности от оригиналното съобщение:
От: Дилян Палаузов <me@example.org>
Тема: subscribe
Дата: Sat, 02 Apr 2022 13:30:37 +0300
Message-ID: <96c072ddd19072b3be2c7ada69d85c0a15c9114d.camel@aegee.org>

- Резултати:
me@example.org is already a MemberRole.member of mailing list aaa@l.bapha.be

- Готово.
```

and the `MemberRole.member` feels unnatural.

Fixes #1121

* Update test_eml_confirm.py

* Update NEWS.rst

* Make the text of AlreadySubscribedError translatable

So that the returned message, when trying to re-subscribe to a mailing
list, is translated.