Add 12 hours expiration preset

[schlimmchen]

This adds a 12 hours expiration preset to the list of expiration presets and renames the "Tomorrow" preset to "24 hours". Fixes #7369 (ignoring the request to allow custom presets, which would be covered by #4896).

Screenshots

Testing strategy

Manual, see screenshot.

Type of change

• ✅ New feature (change that adds functionality)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Project coverage is 64.32%. Comparing base (044fc8d) to head (84af3db).
Report is 462 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/core/TimeDelta.cpp	45.45%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7738      +/-   ##
===========================================
- Coverage    64.32%   64.32%   -0.00%     
===========================================
  Files          339      339              
  Lines        43442    43450       +8     
===========================================
+ Hits         27941    27945       +4     
- Misses       15501    15505       +4     

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