Add "back" button in settings menu

dungeonbattle/menus.py

@@ -70,6 +70,8 @@ class SettingsMenu(Menu):
         self.values.append("")
         self.values.append("Changer le pack de textures n'aura effet")
         self.values.append("qu'après avoir relancé le jeu.")
+        self.values.append("")
+        self.values.append("Retour (espace)")
 
     def handle_key_pressed(self, key: Optional[KeyValues], raw_key: str,
                            game: Any) -> None:
@@ -77,7 +79,9 @@ class SettingsMenu(Menu):
         For now, in the settings mode, we can only go backwards.
         """
         if not self.waiting_for_key:
-            if key == KeyValues.SPACE:
+            if key == KeyValues.SPACE or \
+                    key == KeyValues.ENTER and \
+                    self.position == len(self.values) - 1:
                 game.state = GameMode.MAINMENU
             if key == KeyValues.DOWN:
                 self.go_down()