Get Windows Language in English

function GetLocaleInformation(Flag: Integer): string;
var
 pcLCA: array [0..20] of Char;
begin
 if GetLocaleInfo(LOCALE_SYSTEM_DEFAULT, Flag, pcLCA, 19) <= 0 then
 pcLCA[0] := #0;
 Result := pcLCA;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
 ShowMessage(GetLocaleInformation(LOCALE_SENGLANGUAGE));
end;

Result are like:

French

German

Japanese

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