utelle 8ab635b451 Improve wxLocale backwards compatibility and enhance wxUILocale ...

Restore the old behaviour of wxLocale, which is supposed to use the
default locale and not the preferred language, which may not be the same
(see #22281).

Also apply the following fixes and improvements to wxUILocale:

- Add new GetSystemLocale() method.
- Change the MSW implementation to use the default locale instead of the
  preferred UI language for Windows versions below Windows 10.
- Change the Unix implementation to respect LANGUAGE environment
  variable and use it for determining the preferred UI languages.
- Use wxUILocale in wxTranslations to determine the preferred UI
  languages.
- Use wxUILocale during initialization of internat sample.

Closes #22281.

Closes #22318.

2022-04-17 18:04:21 +02:00

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