Feature: custom "not found" message can increase security #196
Description
With security in mind the tool is used with the one-time-show feature, which is great.
But IF somebody has stolen the link, the addressed receiver gets only the "not found" message.It would be very valuable to put more information about a potential security risk on the screen. Mostly this should include contact information and further steps.
This all depends on concrete technical environment and organisation context.
So it would really helpful to be able to customize these error message in the way it is possible also with THEME_TEXT.
Thank you for this great peece of work!