Rework security realm config GUI

[michael-doubez]

Clarify config GUI and improve internationalization.
Fixes #295 GUI issue of configuring logout from provider when using well known configuration.

Testing done

Tested manually

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.32%. Comparing base (e327bf2) to head (8b7cd22).
Report is 16 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #312      +/-   ##
============================================
- Coverage     73.35%   73.32%   -0.04%     
  Complexity      211      211              
============================================
  Files            10       10              
  Lines           882      881       -1     
  Branches        124      124              
============================================
- Hits            647      646       -1     
  Misses          172      172              
  Partials         63       63              

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