I've figured out how to change sold to sold out or coming soon on product listing but can't seem to change it in the collection listing. It still have the grey circle that says "SOLD" top right hand corner of the listing image. Please help!
Have you tried searching your theme's languages settings? Go to Themes >Actions > Languages and search for "sold". You will see a list of results where "sold" is used on your theme. Change it to anything you want and save your changes.