You can follow along here.
https://support.microsoft.com/en-us/windows/language-packs-for-windows-a5094319-a92d-18de-5b53-1cfc697cfca8
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How to add, Secondary Language Pack via Registry Editor. (Windows 10).
Will this system level change be removed, If end user had gpupdate /force ?
Thanks.
You can follow along here.
https://support.microsoft.com/en-us/windows/language-packs-for-windows-a5094319-a92d-18de-5b53-1cfc697cfca8
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Language-specific registry entries are found as language-specifier subkeys under the key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex\Language\Language_Dialect.
The name of the Language_Dialect key has two parts: the name of the language (Language) and the dialect or secondary language (Dialect).