Missing translations (mainly for entities)

There are still some translations missing:

Adding a member to a council / leaving a council

The intro text mentions committee/Arbeitsgruppe instead of council/Rat:

Add a group member to this committee. To add people not in the parent group, send an invite instead.
Füge ein neues Mitglied der Gruppe dieser Arbeitsgruppe hinzu. Um Leute hinzuzufügen, die nicht zur übergeordneten Gruppe gehören, schicke ihnen stattdessen eine Einladung.

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