Index: branches/5.2.x/core/kernel/utility/validator.php
===================================================================
diff -u -N -r16235 -r16569
--- branches/5.2.x/core/kernel/utility/validator.php	(.../validator.php)	(revision 16235)
+++ branches/5.2.x/core/kernel/utility/validator.php	(.../validator.php)	(revision 16569)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: validator.php 16235 2015-09-02 20:00:17Z alex $
+* @version	$Id: validator.php 16569 2017-07-16 18:04:40Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2011 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -440,15 +440,16 @@
 			$params = array();
 		}
 
-		$field_phrase = $this->Application->isAdmin ? 'la_fld_' . $field : 'lu_fld_' . $field;
-		$params['field'] = $this->Application->Phrase($field_phrase);
-
-		foreach ( $params as $param_name => $param_value ) {
-			$msg = str_replace('{' . $param_name . '}', $param_value, $msg, $replacement_count);
+		if ( $params && preg_match('/%[^\s]/', $msg) ) {
+			$msg = vsprintf($msg, array_values($params));
 		}
+		else {
+			$field_phrase = $this->Application->isAdmin ? 'la_fld_' . $field : 'lu_fld_' . $field;
+			$params['field'] = $this->Application->Phrase($field_phrase);
 
-		if ( strpos($msg, '%s') !== false ) {
-			trigger_error('Unexpected "%s" in field "<b>' . $field . '</b>" validation error message (pseudo: "<b>' . $error_pseudo . '</b>") in "<b>' . $this->dataSource->Prefix . '</b>" unit', E_USER_WARNING);
+			foreach ( $params as $param_name => $param_value ) {
+				$msg = str_replace('{' . $param_name . '}', $param_value, $msg);
+			}
 		}
 
 		return $msg;