GPO deployed software with incorrect language

OK this is a strange one, and I can only suspect this is caused somewhere in Samba-AD.

For a while now, when we try to deploy nextcloud desktop client msi using the UCS GPO, the software doesn’t show up on the end clients.

We finally figured out this is caused by the detected language of the added software:

Our domain is running in English and clearly this package loads as German.

Using MS Orca, we found that the msi has number of supported languages in its config:

Available languages are English (1033), German (1031) etc.

Only after deleting all but 1033 the package is detected as English and shows up in the software list.

My question here is, how do I change Samba-AD (UCR ?) to default to English 1033 and ignore any other language available in the msi?