Inconsistent get_locale on IOS - OS.get_locale() and TranslationServer.get_locale()

[huehue-tangerine]

Godot version:
3.2.2.stable

OS/device including version:
IOS version 13.6
Iphone language: Português
Region: Brasil

Issue description:

Methods TranslationServer.get_locale() and OS.get_locale() returns inconsistent results.

In an Iphone 8 with IOS 13.6

TranslationSever.get_locale() returns: en
OS.get_locale() returns: en_BR

I think both results are wrong. The OS language is Portuguese so the method OS.get_locale() should have returned pt_BR. It returned an invalid locale (en_BR). The same problem occurred with TranslationServer.get_locale().

In an Android phone with similar configuration:
Language: Português (Brasil)

Both methods return pt_BR as result.

Steps to reproduce:

1. Create a project with a simple call to both methods.
   print( OS.get_locale() )
   print( TranslationSever.get_locale() )

2. Export to an IOS project

3. Configure the iphone language to Portuguese (*)

4. Configure the iphone region to Brazil (or Portugal) (*)(**)

5. Install and run with xcode (to see the locale print)

(*) You can use the xcode simulator
(**) I don´t checked if the problem occurs with others countries

Minimal reproduction project:

[naithar]

Yeah, this seems to be an iOS issue with NSLocale/Locale which for some reason returns incorrect identifier for current.
This can be worked around with NSLocale/Locale.preferredLanguages.

print(Locale.current.identifier)
print(Locale.preferredLanguages)

results in

en_BR
["pt-BR", "en-BR"]

[akien-mga]

Fixed by #41172.