Hey there,

I am really sorry for the delay of this reply as it is a public holiday for us here.

These are the language string which used to translated that translation.

COM_KOMENTO_FORM_LEAVE_YOUR_COMMENTS="Leave your comments"

COM_KOMENTO_COMMENTS="Comments"

You can refer this documentation how to override these from backend.

https://stackideas.com/docs/komento/administrators/how-tos/how-to-create-language-string-override