docs: def set_notebook_title(notebook, page_num, title_label):
      """Set the title of a GTK notebook to one of its tab's titles
  
      :param notebook: The GTK notebook
      :param page_num: The page number of a specific tab
      :param title_label: The GTK label holding the notebook's title
      :return: The new title of the notebook
      """
      text = get_notebook_tab_title(notebook, page_num)
      set_label_markup(title_label, text, constants.INTERFACE_FONT, constants.FONT_SIZE_BIG, constants.LETTER_SPACING_1PT)
      return text