COM_EASYSOCIAL_PROFILE_NOTIFICATION_TITLE_POLLS="Polls"

If your site only English, can you try apply above language string into this following file location and see how it goes?

JoomlaFolder\administrator\language\en-GB\en-GB.com_easysocial.ini

If the issue still persists, can you provide us with your Joomla backend and FTP access so we can better have a look?