confirm group membership ending

[rouven0]

Currently, when you click on the 'End membership' button on a group (intended or accidentally), the group membership is ended without any confirmation, leading to possible unwanted situations.

This PR implements a simple confirmation form before performing the actual ending operation.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 87.96%. Comparing base (2c6fb8c) to head (0086cf8). Report is 11 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #767      +/-   ##
===========================================
+ Coverage    87.88%   87.96%   +0.08%     
===========================================
  Files          275      275              
  Lines        16953    16982      +29     
===========================================
+ Hits         14899    14939      +40     
+ Misses        2054     2043      -11     

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[agmes4]

I added the test so we can close this merge request successfully

[agmes4]

now its test driven :P

[lukasjuhrich]

now its test driven :P

Not quite: „test driven“ refers to the ideology that in order to write correct code, you need to write tests first. This makes sense some times, but is unhelpful as a default mentality.

[lukasjuhrich]

@agmes4 Nevermind, I now saw the commit order and got the joke…