-Translation text will change automatically for in-game buttons, labels, poups when translation is changed.

-Added a NOTIFICATION_TRANSLATION_CHANGED for controls that need custom code
-Sorry, editor will not update automatically because it uses a different translatio method.

core/os/main_loop.h

@@ -54,6 +54,7 @@ public:
 		NOTIFICATION_WM_QUIT_REQUEST = 7,
 		NOTIFICATION_WM_UNFOCUS_REQUEST = 8,
 		NOTIFICATION_OS_MEMORY_WARNING = 9,
+		NOTIFICATION_TRANSLATION_CHANGED = 10,
 	};
 
 	virtual void input_event( const InputEvent& p_event );