BUG 8529 Change "exists" to "exist" in many phrases SOLVED

- Remember these grammar rules
- Changed grammar rules as suggested.

workflow/engine/classes/model/Gateway.php

@@ -110,7 +110,7 @@ class Gateway extends BaseGateway {
         return true;
       }
       else {
-        throw(new Exception('This row doesn\'t exists!'));
+        throw(new Exception('This row does not exist!'));
       }
     }
     catch (Exception $oError) {