How to use the harvesters._private.frontend.helper.compose_tooltip function in harvesters

compose_tooltip('Stop image acquisition', shortcut_key)
        )
        button_stop_acquisition.setShortcut(shortcut_key)
        button_stop_acquisition.toggle()
        observers.append(button_stop_acquisition)
        self._action_stop_image_acquisition = button_stop_acquisition

        #
        button_dev_attribute = ActionShowAttributeController(
            icon='device_attribute.png', title='Device Attribute', parent=self,
            action=self.action_on_show_attribute_controller,
            is_enabled=self.is_enabled_on_show_attribute_controller
        )
        shortcut_key = 'Ctrl+a'
        button_dev_attribute.setToolTip(
            compose_tooltip('Edit device attribute', shortcut_key)
        )
        button_dev_attribute.setShortcut(shortcut_key)
        button_dev_attribute.toggle()
        observers.append(button_dev_attribute)

        #
        self._widget_about = About(self)
        button_about = ActionShowAbout(
            icon='about.png', title='About', parent=self,
            action=self.action_on_show_about
        )
        button_about.setToolTip(
            compose_tooltip('Show information about Harvester')
        )
        button_about.toggle()
        observers.append(button_about)

observers.append(button_about)

        #
        self._widget_device_list = ComboBox(self)
        self._widget_device_list.setSizeAdjustPolicy(
            QComboBox.AdjustToContents
        )
        shortcut_key = 'Ctrl+Shift+d'
        shortcut = QShortcut(QKeySequence(shortcut_key), self)

        def show_popup():
            self._widget_device_list.showPopup()

        shortcut.activated.connect(show_popup)
        self._widget_device_list.setToolTip(
            compose_tooltip('Select a device to connect', shortcut_key)
        )
        observers.append(self._widget_device_list)
        for d in self.harvester_core.device_info_list:
            self._widget_device_list.addItem(d)
        group_connection.addWidget(self._widget_device_list)
        observers.append(self._widget_device_list)

        #
        button_select_file.add_observer(button_update)
        button_select_file.add_observer(button_connect)
        button_select_file.add_observer(button_disconnect)
        button_select_file.add_observer(button_dev_attribute)
        button_select_file.add_observer(button_start_acquisition)
        button_select_file.add_observer(button_toggle_drawing)
        button_select_file.add_observer(button_stop_acquisition)
        button_select_file.add_observer(self._widget_device_list)

button_select_file.setToolTip(
            compose_tooltip('Open a CTI file to load', shortcut_key)
        )
        button_select_file.setShortcut(shortcut_key)
        button_select_file.toggle()
        observers.append(button_select_file)

        #
        button_update = ActionUpdateList(
            icon='update.png', title='Update device list', parent=self,
            action=self.action_on_update_list,
            is_enabled=self.is_enabled_on_update_list
        )
        shortcut_key = 'Ctrl+u'
        button_update.setToolTip(
            compose_tooltip('Update the device list', shortcut_key)
        )
        button_update.setShortcut(shortcut_key)
        button_update.toggle()
        observers.append(button_update)

        #
        button_connect = ActionConnect(
            icon='connect.png', title='Connect', parent=self,
            action=self.action_on_connect,
            is_enabled=self.is_enabled_on_connect
        )
        shortcut_key = 'Ctrl+c'
        button_connect.setToolTip(
            compose_tooltip(
                'Connect the selected device to Harvester',
                shortcut_key

button_start_acquisition.setToolTip(
            compose_tooltip('Start image acquisition', shortcut_key)
        )
        button_start_acquisition.setShortcut(shortcut_key)
        button_start_acquisition.toggle()
        observers.append(button_start_acquisition)

        #
        button_toggle_drawing = ActionToggleDrawing(
            icon='pause.png', title='Pause/Resume Drawing', parent=self,
            action=self.action_on_toggle_drawing,
            is_enabled=self.is_enabled_on_toggle_drawing
        )
        shortcut_key = 'Ctrl+k'
        button_toggle_drawing.setToolTip(
            compose_tooltip('Pause/Resume drawing', shortcut_key)
        )
        button_toggle_drawing.setShortcut(shortcut_key)
        button_toggle_drawing.toggle()
        observers.append(button_toggle_drawing)

        #
        button_stop_acquisition = ActionStopImageAcquisition(
            icon='stop_acquisition.png', title='Stop Acquisition', parent=self,
            action=self.action_on_stop_image_acquisition,
            is_enabled=self.is_enabled_on_stop_image_acquisition
        )
        shortcut_key = 'Ctrl+l'
        button_stop_acquisition.setToolTip(
            compose_tooltip('Stop image acquisition', shortcut_key)
        )
        button_stop_acquisition.setShortcut(shortcut_key)

shortcut_key = 'Ctrl+a'
        button_dev_attribute.setToolTip(
            compose_tooltip('Edit device attribute', shortcut_key)
        )
        button_dev_attribute.setShortcut(shortcut_key)
        button_dev_attribute.toggle()
        observers.append(button_dev_attribute)

        #
        self._widget_about = About(self)
        button_about = ActionShowAbout(
            icon='about.png', title='About', parent=self,
            action=self.action_on_show_about
        )
        button_about.setToolTip(
            compose_tooltip('Show information about Harvester')
        )
        button_about.toggle()
        observers.append(button_about)

        #
        self._widget_device_list = ComboBox(self)
        self._widget_device_list.setSizeAdjustPolicy(
            QComboBox.AdjustToContents
        )
        shortcut_key = 'Ctrl+Shift+d'
        shortcut = QShortcut(QKeySequence(shortcut_key), self)

        def show_popup():
            self._widget_device_list.showPopup()

        shortcut.activated.connect(show_popup)

shortcut_key
            )
        )
        button_connect.setShortcut(shortcut_key)
        button_connect.toggle()
        observers.append(button_connect)

        #
        button_disconnect = ActionDisconnect(
            icon='disconnect.png', title='Disconnect', parent=self,
            action=self.action_on_disconnect,
            is_enabled=self.is_enabled_on_disconnect
        )
        shortcut_key = 'Ctrl+d'
        button_disconnect.setToolTip(
            compose_tooltip(
                'Disconnect the device from Harvester',
                shortcut_key
            )
        )
        button_disconnect.setShortcut(shortcut_key)
        button_disconnect.toggle()
        observers.append(button_disconnect)

        #
        button_start_acquisition = ActionStartImageAcquisition(
            icon='start_acquisition.png', title='Start Acquisition', parent=self,
            action=self.action_on_start_image_acquisition,
            is_enabled=self.is_enabled_on_start_image_acquisition
        )
        shortcut_key = 'Ctrl+j'
        button_start_acquisition.setToolTip(

button_toggle_drawing.setToolTip(
            compose_tooltip('Pause/Resume drawing', shortcut_key)
        )
        button_toggle_drawing.setShortcut(shortcut_key)
        button_toggle_drawing.toggle()
        observers.append(button_toggle_drawing)

        #
        button_stop_acquisition = ActionStopImageAcquisition(
            icon='stop_acquisition.png', title='Stop Acquisition', parent=self,
            action=self.action_on_stop_image_acquisition,
            is_enabled=self.is_enabled_on_stop_image_acquisition
        )
        shortcut_key = 'Ctrl+l'
        button_stop_acquisition.setToolTip(
            compose_tooltip('Stop image acquisition', shortcut_key)
        )
        button_stop_acquisition.setShortcut(shortcut_key)
        button_stop_acquisition.toggle()
        observers.append(button_stop_acquisition)
        self._action_stop_image_acquisition = button_stop_acquisition

        #
        button_dev_attribute = ActionShowAttributeController(
            icon='device_attribute.png', title='Device Attribute', parent=self,
            action=self.action_on_show_attribute_controller,
            is_enabled=self.is_enabled_on_show_attribute_controller
        )
        shortcut_key = 'Ctrl+a'
        button_dev_attribute.setToolTip(
            compose_tooltip('Edit device attribute', shortcut_key)
        )

shortcut_key
            )
        )
        button_connect.setShortcut(shortcut_key)
        button_connect.toggle()
        observers.append(button_connect)

        #
        button_disconnect = ActionDisconnect(
            icon='disconnect.png', title='Disconnect', parent=self,
            action=self.action_on_disconnect,
            is_enabled=self.is_enabled_on_disconnect
        )
        shortcut_key = 'Ctrl+d'
        button_disconnect.setToolTip(
            compose_tooltip(
                'Disconnect the device from Harvester',
                shortcut_key
            )
        )
        button_disconnect.setShortcut(shortcut_key)
        button_disconnect.toggle()
        observers.append(button_disconnect)

        #
        button_start_acquisition = ActionStartImageAcquisition(
            icon='start_acquisition.png', title='Start Acquisition', parent=self,
            action=self.action_on_start_image_acquisition,
            is_enabled=self.is_enabled_on_start_image_acquisition
        )
        shortcut_key = 'Ctrl+j'
        button_start_acquisition.setToolTip(