Fix error reponses

Signed-off-by: Asai Neko <sugar@sne.moe>

data/client.go

@@ -87,5 +87,5 @@ func (self *Client) ValidateRedirectURI(redirectURI string) error {
 			return nil
 		}
 	}
-	return errors.New("redirect uri not match")
+	return errors.New("[Client Data] redirect uri not match")
 }