try to improve multilanguage on form field validator error

interface/lib/classes/tform.inc.php

@@ -643,7 +643,7 @@ class tform {
                                         if($vip==0) {
                                                 $errmsg = $validator['errmsg'];
                                                 if(isset($this->wordbook[$errmsg])) {
-                                                    $this->errorMessage .= $this->wordbook[$errmsg]."<br />\r\n";
+                                                    $this->errorMessage .= $field_name.": ".$this->wordbook['ipv4_validator_error_txt']."<br />\r\n";
 												} else {
 													$this->errorMessage .= $errmsg."<br />\r\n";
 												}

interface/web/lang/lib/lang/en_tform.lng

 <?php
 $wb['btn_save_txt'] = "Save";
 $wb['btn_cancel_txt'] = "Cancel";
+$wb['ipv4_validator_error_txt'] = "Is not valid IP address";
 ?>