Rename "start" option to "new game"

By popular request. Aizu said that "start" looks ugly since it's too
short compared to the rest of the menu options.

desktop_version/src/Game.cpp

@@ -7045,7 +7045,7 @@ void Game::createmenu( enum Menu::MenuName t, bool samemenu/*= false*/ )
                 }
                 else
                 {
-                    option("start");
+                    option("new game");
                 }
                 //ok, secret lab! no notification, but test:
                 if (unlock[8])