Trouver la langue utilisée dans Windows

function GetWindowsLanguage : string;
var
WinLanguage: array [0..50] of char;

begin
VerLanguageName(GetSystemDefaultLangID,WinLanguage,50);
Result := StrPas(WinLanguage);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(GetWindowsLanguage);
end;