Closes issue #91

Oliver Falk requested to merge issue91 into master

In case someone tries to confirm a mail address that someone else has confirmed already, return a reasonable response / message instead of failing with a server error (500). This is a very rare case that should only happen if two users add the same mail address (and do not confirm) and then both confirm, since there is already a check that should prevent someone from adding a mail address that has been confirmed already.

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