Hello,
1) Unfortunately, there is no option in theme settings to add a scroll to the bottom button.
2) To translate the tooltip-text of the icons on the navbar you need to install and use loco translate WordPress plugin. Then you need to choose the correct path to translate the text.
In your case the path will be Loco Translate >> Themes >> Woodmart.
You can also watch the video on how to translate strings using loco in the following link:
https://www.youtube.com/watch?v=D3NsDdMzsls
Best Regards.