Changing validation messages.

main/inc/Entity/User.php

@@ -290,16 +290,16 @@ class User implements AdvancedUserInterface, \Serializable , EquatableInterface
         $metadata->addPropertyConstraint('email', new Assert\Email());
 
         $metadata->addConstraint(new UniqueEntity(array(
-            'fields'  => 'username',
-            'message' => 'This username already exists.',
-        )));
+                'fields'  => 'username',
+                'message' => 'This value is already used.',
+            )));
 
         $metadata->addPropertyConstraint('username', new Assert\Length(array(
-            'min'        => 2,
-            'max'        => 50,
-            'minMessage' => 'Your username must be at least {{ limit }} characters length',
-            'maxMessage' => 'Your username cannot be longer than {{ limit }} characters length',
-        )));
+                'min'        => 2,
+                'max'        => 50,
+                'minMessage' => 'This value is too short. It should have {{ limit }} character or more.',
+                'maxMessage' => 'This value is too long. It should have {{ limit }} character or less.',
+            )));
     }
 
     /**