Cupboard for Friends only allows friends of already authorized people to authorize themselves at the cupboard. The plugin blocks strangers or raiders from authorizing at Cupboards of others, if nobody of the already authorized people has the player in his friend list.
Localization
The default messages are in the CupboardForFriends file under the lang/en directory. To add support for another language, create a new language folder (e.g. de for German) if not...