This is about the team request notification which team administrator receives.
"User requested to join your team
XXX has requested to join the team YYY.
Congratulations! Your application to join the team has been approved. You are now a member of the team YYY."
Obviously the last sentence (COM_EASYBLOG_NOTIFICATION_TEAM_REQUEST_APPROVED) is incorrectly included here.
Hope you will fix it. (although I know email template can be customized.)