Yes, use a language override. The language constant is COM_EASYSOCIAL_PROFILE_DELETE_CONFIRMATION

To do this go to yoursite/administrator/index.php?option=com_languages&view=overrides

- Click the new button

- In the field called "Language Constant" put in COM_EASYSOCIAL_PROFILE_DELETE_CONFIRMATION

- In the textbox put in the desired text

- Hit save

I found the language constant simply by typing in the values field (right side) "are you sure you want to delete your profile" and it gave a pretty specific result. When the result set for language constants is big, just be more specific and write more.