Hello, @Soumya,
You have to change/translate it into the WCFM plugin language files, you can use the Loco translate plugin for it, please watch this video I have captured for you: https://www.veed.io/view/799a5b09-dd28-4495-9176-0d0dbd74cced?sharingWidget=true&panel=share
Regards 8Themes Team.