More friendly 401 message for agenda items only accessible to members

[Jelmer van der Linde]

Currently you get a very unfriendly message when trying to access an agenda item that can only be viewed by members. Should be a bit more kind (so that people are more willing to log in or become a member?)

[Jelmer van der Linde]

Same for not found messages by the way.

[Jelmer van der Linde]

Friendly error message when accessing inaccessible agenda item

Fixes issue #72.

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