Unit defaults to inch (does not respect language settings)

Describe the bug Units default to inch even if a European country is chosen in language settings (e.g. Germany).

To Reproduce Steps to reproduce the behavior:

Go to Personal settings and change language and region to German/Germany
Open Nextcloud office (e.g. create new document)
Look at the units shown in the side bar (screenshots below)

Expected behavior All units within Nextcloud Office should be aligned to the chosen language in personal nextcloud settings. If German is chosen, unit should default to "cm" instead of inch. I wasn't able to find a way to change the unit manually.

Screenshots Nextcloud language setting:

Nextcloud office units in inch (should be cm):

Client details:

OS: Ubuntu 24.04
Browser Firefox
Version 127
Device: Desktop

Server details

Operating system: Ubuntu 22.04

Web server: apache2

Database: postgresql

PHP version: 8.1

Nextcloud version: 29.0.2

Version of the richdocuments app 8.4.3

Version of Collabora Online 24.04.4.2

Configuration of the richdocuments app

{
    "apps": {
        "richdocuments": {
            "installed_version": "8.4.3",
            "disable_certificate_verification": "",
            "canonical_webroot": "",
            "external_apps": "",
            "types": "prevent_group_restriction",
            "wopi_allowlist": "192.168.5.0\/24",
            "wopi_url": "https:\/\/office.my-domain.de",
            "public_wopi_url": "https:\/\/office.my-domain.de",
            "enabled": "yes"
        }
    }
}

Logs

#### Nextcloud log (data/nextcloud.log) ``` n/a ``` #### Browser log ``` n/a ```

nextcloud / richdocuments

Unit defaults to inch (does not respect language settings) #3786

Server details