OS.get_locale in Windows does not match sublang

[ippan]

Godot version:
3.2

OS/device including version:
Windows 10

Issue description:

OS.get_locale() does not return full locale
Ex: 'zh_TW' or 'zh_CN' will return 'zh' only

String OS_Windows::get_locale() const {

	const _WinLocale *wl = &_win_locales[0];

	LANGID langid = GetUserDefaultUILanguage();
	String neutral;
	int lang = langid & ((1 << 9) - 1);
	int sublang = langid & ~((1 << 9) - 1);

	while (wl->locale) {

		if (wl->main_lang == lang && wl->sublang == SUBLANG_NEUTRAL)
			neutral = wl->locale;

		if (lang == wl->main_lang && sublang == wl->sublang)
			return wl->locale;

		wl++;
	}

	if (neutral != "")
		return neutral;

	return "en";
}

may be change to int sublang = langid >> 10; will work.

[Calinou]

This seems to be Windows-specific, as I get en_US on Linux (with my system configured in English). So this is indeed a bug.

[denormative]

Looks like this is OS-specific. I get "en-AU" on OSX (correct), "en_US" on linux (correct), and "en" on windows (only half correct).