BUG #18207: Turkiye LC Setting Error

The following bug has been logged on the website:

Bug reference:      18207
Logged by:          Aydin Atak
Email address:      aydinatak@gmail.com
PostgreSQL version: 15.5
Operating system:   Windows 11
Description:

I am sorry for my English.

In the KB5031455 update package released for Microsoft Windows 11 on October
31, 2023, "Republic of Turkey" changed its name to "Republic of Türkiye".
For this reason, Postgresql databases previously installed as
"Turkish_Turkey.1254" do not work.  Because this locale turns into a
situation similar to "Turkish_Týrkiye".  The error is: "postgresql.conf
contains errors". We are currently running this update by uninstalling it.
How can we solve it? 

Thanks for your interesting. Regards.