[vim/vim] Vim does not respect Windows display language or preferred languages (Issue #20855)

mnissl created an issue (vim/vim#20855)

### Steps to reproduce

Vim does not respect the Windows display language or one of the preferred lanuages for the UI language. Instead vim uses the regional format.

Example: Windows display language is set to `English (United States)` and regional format to `German (Germany)`. `:language` outputs:

`Momentane Sprache: "LC_COLLATE=German_Germany.1252;LC_CTYPE=C;LC_MONETARY=German_Germany.1252;LC_NUMERIC=C;LC_TIME=Germa
n_Germany.1252"`

<img width="1042" height="1222" alt="Image" src="https://github.com/user-attachments/assets/3f5d5b14-8c37-4d21-bebc-6428f7855736" />

### Expected behaviour

Vim should use the Windows display language or one of the preferred lanuages (if set) as its UI language.

### Version of Vim

9.2.782

### Environment

Windows 11

### Logs and stack traces

```shell

```

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