Add: Allow the update of setting variables for time and date formats (backport #179)

[mergify]

What

Allows the update of setting variables for time and date formats.

Why

To allow updating time and date formats from GSA user settings independently of the language.

References

GEA-430
requires #2283

---

This is an automatic backport of pull request #179 done by [Mergify](https://mergify.com).

[github-actions]

Conventional Commits Report

Type	Number
Added	1

🚀 Conventional commits found.

[codecov]

Codecov Report

Attention: Patch coverage is 4.54545% with 42 lines in your changes missing coverage. Please review.

Project coverage is 5.72%. Comparing base (15e1b45) to head (7fa6428).
Report is 4 commits behind head on oldstable.

Files with missing lines	Patch %	Lines
src/gsad_gmp.c	0.00%	42 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           oldstable    #183      +/-   ##
============================================
- Coverage       5.73%   5.72%   -0.01%     
============================================
  Files             17      17              
  Lines           8358    8402      +44     
  Branches         943     951       +8     
============================================
+ Hits             479     481       +2     
- Misses          7870    7912      +42     
  Partials           9       9              

Flag	Coverage Δ
unittests	5.72% <4.54%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.