How to get Locales Info 

unit loc_unit;
interface
uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
var
  Form1        : TForm1;
  LocalesList  : TStringList;
implementation
{$R *.DFM}
function SystemLocales(Locale : PChar) : Bool; stdcall; export;
Var
 Data     : Array[0..63] of Char;
 Full     : Array[0..63] of Char;
begin
 GetLocaleInfo(StrToInt('$'+Locale), LOCALE_SENGLANGUAGE, @Full, 64);
 GetLocaleInfo(StrToInt('$'+Locale), LOCALE_SENGCOUNTRY, @Data, 64);
 LocalesList.Add(StrPas(Locale)+' '+StrPas(Full)+' ('+StrPas(Data)+')');
 Result := True;      {True to continue}
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
 EnumSystemLocales(@SystemLocales, LCID_INSTALLED);
 ListBox1.Items := LocalesList;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
 LocalesList := TStringList.Create;
end;
end.