No error shown when attempting to delete a founder

Problem: If you try to delete a founder the message returned is “User details updated.“ on the green success background. The user is not deleted, which is good, but there is no indication it actually failed other than later manually finding the user has not been deleted.

Fix: Add a new error message key and value that will show when an attempt is made to delete a founder. Move the check for founder status from the $delete conditional to a separate check inside it, similar to the checks for deleting yourself or Anonymous.