Custom locales seem not to work

[Thomas Wolff]

Am 21.06.2021 um 15:23 schrieb Алекса -скрыто- via Cygwin:
> I noticed that Cygwin-linked applications fail to use the proper language code from a Windows custom locale, and revert to C instead. Is that a bug?
If you define a Windows custom locale, how would you expect it to be 
referred to from cygwin, i.e. which POSIX locale name should be used to 
be mapped to it and how should this mapping be magically deployed into 
cygwin?
I don't think such a mechanism can easily be designed or implemented.
Thomas