[app] Change select box filter

[ricoberger]

We are now always comparing the lower case values in the select box
filter.

• I added a CHANGELOG entry for this change.
• I adjusted the corresponding documentation for this change.
• I adjusted the values.yaml file and the documentation for all values.

[codecov-commenter]

Codecov Report

Merging #377 (dab46a3) into main (c211a21) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #377   +/-   ##
=======================================
  Coverage   45.35%   45.35%           
=======================================
  Files         132      132           
  Lines       10295    10295           
=======================================
  Hits         4669     4669           
  Misses       5548     5548           
  Partials       78       78           

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