docs: def create_button_label(icon, font_size=constants.FONT_SIZE_NORMAL):
      """Create a button label with a chosen icon.
  
      :param icon: The icon
      :param font_size: The size of the icon
      :return: The created label
      """
      label = Gtk.Label()
      set_label_markup(label, '&#x' + icon + ';', constants.ICON_FONT, font_size)
      label.show()
      return label