How to programmatically edit input language services?

Question

C++ / C#

Greetings, It is
necessary to programmatically add / remove input languages.
What functions are used to do this?
In which direction to dig, how to google?
A simplified example of what you need:
- There are two buttons "Set RU, EN", "Set RU, EN, DE"
- By pressing the button, it is necessary that only the specified set of input languages ​​\u200b\u200bremain in the system.

Answer 1

With the help of WinAPI functions, I think from the user32 library.
c# change system language
c# change system keyboard input language
c++ set system language
c++ set system keyboard input language
winapi add system language
winapi add system keyboard input language