See these links:
https://www.tenforums.com/tutorials/3813-add-remove-change-display-language-windows-10-a.html
https://www.tenforums.com/tutorials/3815-region-language-settings-copy-windows-10-a.html
https://www.tenforums.com/tutorials/136792-change-display-language-windows-10-a.html
https://www.eightforums.com/threads/language-pack-install-or-uninstall-in-windows-8.5850/#option1s6
.
.
.
.
.
Please remember to vote and to mark the replies as answers if they help.
On the bottom of each post there is:
Propose as answer = answered the question
On the left side of each post: Vote = a helpful post
.
.
.
.
.