Incorrect behavior of GetCurrencyFormatW/GetNumberFormatW with regard of the "grouping" parameter

Using : reactos-bootcd-0.4.15-dev-4914-g2220e56-x86-gcc-lin-dbg

GetCurrencyFormatW does NOT behave as expected with regard to the "grouping" parameter. I've not explored other settings (in particular negative formating, ...) but it seems that the current implementation is incorrect. 

Impact : GetCurrencyFormatW is typically used in Finance/Money management software to have specific numbers formatting.

This API was improved in the past by CORE-17009 in order to correctly behave for the "standards" format used in the CPL, but this was not enougth

Attached to this issue a screenshot and the small test app i've written to reproduce the case.

Guilty Code: https://github.com/reactos/reactos/blob/master/dll/win32/kernel32/winnls/string/lcformat.c#L1804

Note : GetNumberFormatW is suffering from a similar weakness with a rather dirty hack for the "32" grouping case, see lcformat.c / https://github.com/reactos/reactos/blob/master/dll/win32/kernel32/winnls/string/lcformat.c#L1394

Wine 10.9 is NOT affected, in particular following this commit https://github.com/wine-mirror/wine/commit/9afc20949a4d63c4d1323683aeda4f7af13f3969