Add financial markets l10n support

[KJhellico]

Proposed change

Add financial markets l10n support to generate_po_files.py script.

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/pin/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've successfully run make check, all checks and tests are green

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1baee5f) to head (63077b2).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##               dev     #2116   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          192       192           
  Lines        11591     11591           
  Branches      1747      1747           
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  Hits         11591     11591           

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[PPsyrius]

LGTM 💹

[arkid15r]

Thanks for extending i18n to markets too!

Just a side note -- we now have both countries and markets .po files in the same locations. Not sure if it's possible to structure them better.