Requirements

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Is your proposal related to a problem?

I am running an instance for a specific country (Georgia) where people's browsers do not always carry the language information (a lot of people use English as their system/browser language).

This means that when a new user signs up, their profile settings are set to "Undetermined" and "English" only so everything (which is literally everything) posted in language "ქართული" is not displayed. and it is very inconvenient to explain to the user to go to their settings and press Ctrl and look for "ქართული" and then posts will be displayed.

Describe the solution you'd like.

Allow admins from the admin panel to select languages that should be selected for every newly registered user.

I guess it should be very simple to do this. As it was explained to me:
"The default languages for creating a new user are taken from all the languages in your browser's Accept-Language header, then we add UNDETERMINED to it."

So maybe add a list of languages to admin panel that should also be added for a new user regisration.

Describe alternatives you've considered.

Other way is to modify the code and maintain my own branch. I want to follow the official branch and not break upgrades.

Additional context

No response