bug#51832: Piping unicode text in `shell-command'

[Philipp]

> Am 14.11.2021 um 14:41 schrieb Lars Ingebrigtsen <larsi@gnus.org>:
> 
> Alan Third <alan@idiocy.org> writes:
> 
>> I've attached a patch that may do something towards preventing this
>> problem but ultimately this is a convenience to give a best guess at
>> choosing the correct dictionary, date format, etc. If we can't easily
>> fix it then we can drop it and tell people to set it in their init.el
>> themselves.
> 
> That didn't fix the issue for me, I'm afraid -- with that patch, LANG is
> still the invalid en_NO.UTF-8 for me.

Maybe we should add similar logic as iTerm2 
(https://github.com/gnachman/iTerm2/blob/79aff4d59fd591e7628649bcabe5f27541740bf6/sources/PTYSession.m#L7107):
 create the locale identifier from language code and country code instead of 
the current locale identifier, and use setlocale (or better, newlocale) to 
check whether it's valid, and fall back to en_US.UTF-8 otherwise?