init python:
    import inspect

    def replace_text(text):

        frame = inspect.currentframe().f_back
        who = frame.f_locals.get('who')
        name = who.name if hasattr(who, 'name') else who

        if name == '[mcname]':                                           
            text = text.replace("Anna", "Mom")


        return text

    config.say_menu_text_filter = replace_text