(svn r2594) Fix: [strgen] Misc updates to the string system.

- Renamed the plural command to "P" instead of "PLURAL". Now write something like this to append an s on plural: {P "" s}. (You can optionally still add an argument index to explicitly specifiy which number that's used)
  - Removed the pluralized cargo strings from the string files. The new method is to use the plural specifier {P}
  - Added support for genders. First add "##gender der das die" on top, then use {G=der} on a cargoname/industry to set the gender, and to switch between genders do something like {G neu neu neue} {STRING}
  - Updated the swedish/english translation with P strings.

station_gui.c

@@ -372,7 +372,7 @@ static void DrawStationViewWindow(Window *w)
 		if ( st->goods[i].enroute_from == station_id) {
 			if (--pos < 0) {
 				SetDParam(1, waiting);
-				SetDParam(0, _cargoc.names_long_s[i] + (waiting==1 ? 0 : 32));
+				SetDParam(0, _cargoc.names_long[i]);
 				DrawStringRightAligned(x + 234, y, STR_0009, 0);
 				y += 10;
 			}
@@ -380,7 +380,7 @@ static void DrawStationViewWindow(Window *w)
 			/* enroute */
 			if (--pos < 0) {
 				SetDParam(1, waiting);
-				SetDParam(0, _cargoc.names_long_s[i] + (waiting==1 ? 0 : 32));
+				SetDParam(0, _cargoc.names_long[i]);
 				DrawStringRightAligned(x + 234, y, STR_000A_EN_ROUTE_FROM, 0);
 				y += 10;
 			}