Add presentation for buttons.

addons/accessibility/accessibility.gd

@@ -15,7 +15,6 @@ func augment_tree(node):
 func set_initial_screen_focus(screen):
     self.augment_tree(get_tree().root)
     var focus = find_focusable_control(get_tree().root)
-    print("Focus ",focus, focus.is_in_group("accessible"))
     if not focus:
         return
     focus.grab_click_focus()

addons/accessibility/accessible.gd

@@ -3,7 +3,13 @@ extends Object
 var node
 
 func focused():
-    print("Focus entered.", self.node)
+    if node is Button:
+        var text = "Unlabelled"
+        if node.text:
+            text = node.text
+        print("%s: button" % text)
+    else:
+        print("Focus entered.", self.node)
 
 func unfocused():
     pass