Hi, my name is Nigel and I am an Independent Advisor here to try and work with you on this issue you are having.
Please note that not all language packs support all display items. Some languages may only support a small set of text to be translated while the other text remains in the default language. If you want to use Windows 10 in a specific language fully, you should download and install Windows 10 in that specific language. The following features are available in the Windows 10 language packs:
Display language
Text to speech
Speech recognition
Handwriting
Below is an article to change the language using a GUI option
https://www.tenforums.com/tutorials/118777-chan...
There is also the option of changing the language using Powershell. Please see the link below
https://gallery.technet.microsoft.com/scriptcen...
Hope this helps!
Feel free to ask back any questions and let me know how it goes.
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