What registry entries change when enabling the language bar?

I don't know if it fits here, mods, if it fits somewhere else move it.

I am trying to figure out what registry entries change when enabling the language bar, so i can enable it on UAC prompts and maybe the login screen too.

For those who don't know, there is an option on Windows to enable the language bar:

The difference between the input indicator and language bar, is that the language bar looks more classic, and is a band that can be placed either on the taskbar or desktop.

What i am trying to accomplish: Enabling the language bar at UAC prompts and the login screen, by setting it at the system user

The issue is, the SYSTEM user doesn't run file explorer (not explorer.exe, the file explorer in explorer.exe), so you cannot use control panel to change it.

So is there anyone who knows the registry entries it changes?