Fix the user-manage-organisations modal (column name & search)

locale/en_US/messages.php

@@ -143,4 +143,6 @@ return [
     'LEAVE'                              => 'Leave',
 
     'ACTION_CANNOT_UNDONE'               => 'This action cannot be undone!',
+
+    'IS_ADMINISTRATOR'                   => 'Administrator?',
 ];