lc_collate mess

Hi there,

the new PostgreSQL has been created from scratch by standard
installation with German_Switzerland, then it does not know:

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C:\Users\postgres\Documents>pg_upgrade.exe --old-datadir "C:/Program
Files/PostgreSQL/12/data" --new-datadir "C:/Program
Files/PostgreSQL/13/data" --old-bindir "C:/Program
Files/PostgreSQL/12/bin" --new-bindir "C:/Program
Files/PostgreSQL/13/bin" --check
Führe Konsistenzprüfungen durch
-------------------------------
Checking cluster versions                                   ok
Checking database user is the install user                  ok
Checking database connection settings                       ok
Checking for prepared transactions                          ok
Checking for reg* data types in user tables                 ok
Checking for contrib/isn with bigint-passing mismatch       ok

lc_collate-Werte für Datenbank »postgres« stimmen nicht überein: alt
»German_Switzerland.1252«, neu »German_Germany.1252«
Fehlgeschlagen, Programm wird beendet

C:\Users\postgres\Documents>

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where is a hint how to fix that? New PostgreSQL did not yet start up, of
course.

Previous migration vom PostgreSQL 9 to PostgreSQL 12 was a messy
nightmare, still not okay.

Thanks in advance

Udo.