CmdID

CmdID / PowerShell / Cmdlets / Set

Set-SystemPreferredUILanguage

Sets the provided language as the System Preferred UI Language. Windows Server PowerShell reference

From the Windows Server PowerShell reference 2 parameters Its page in the reference

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Parameters

2 in the Windows Server PowerShell reference
-Language, -LanguageId, -LanguageTagThe bcp47 tag of the language to set as the System Preferred UI Language.
-PassThruIf specified, this parameter returns the bcp47 tag of the language upon successful configuration of the System Preferred UI Language.