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Tinkering with localization (translations of my apps) I had to determine the local language string ('en', 'de', 'nl' etc).
Figured this little trick helps other macOS devs. This function returns the ISO6391 language code (2 characters) or an empty string if it fails.
uses
... CocoaUtils , CFLocale ...
...
function MacOSGetCurrentLocale:string;
var
CurrentLocale: CFLocaleRef;
begin
Result := '';
CurrentLocale:=CFLocaleCopyCurrent;
if Assigned(CurrentLocale) then
Result := CFStringToStr(CFLocaleGetValue(CurrentLocale, kCFLocaleLanguageCode));
end;
Note: do not forget to include the two units in the uses clause.