Description:
With regional settings set to have a comma as decimal separator (Windows 11 in french), numbers (real numbers) are correctly shown with a comma in Calc.

However, complex number functions, such as COMPLEX.RACINE (french for IMSQRT), have results using a point as decimal separator.

Those functions correctly take complex numbers with comma separator as /input/, but the output doesn't follow regional settings.

As I understand it, since complex numbers in Calc are actually strings and are therefore not automatically translated when opened on a machine with different regional settings, it's necessary for those functions to accept strings with comma or point separator, and it seems to work (though I don't think thousand separators are handled correctly, but it's a minor inconvenience, and it could be ambiguous anyway). However, it would be nice to have output follow the regional settings for the decimal separator, and use a comma when needed.

This behavior seems to happen with all complex number functions.

I mark the severity as trivial as it does not affect numerical results. It's more a "visual bug", and it depends on regional settings.

Steps to Reproduce:
Set system decimal separator as comma.
In any empty cell: =COMPLEXE.RACINE(-2) (french function) or =IMSQRT(-2).

Actual Results:
1.4142135623731i

Expected Results:
1,4142135623731i


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.5.5.2 (X86_64) / LibreOffice Community
Build ID: ca8fe7424262805f223b9a2334bc7181abbcbf5e
CPU threads: 12; OS: Windows 10.0 Build 22621; UI render: Skia/Vulkan; VCL: win
Locale: fr-FR (fr_FR); UI: fr-FR
Calc: CL threaded