diff --git a/resources/app_languages.php b/resources/app_languages.php
index 4f52aefbac..fbe5593916 100644
--- a/resources/app_languages.php
+++ b/resources/app_languages.php
@@ -1,5 +1,5 @@
 <?php
-#This file was last reorganized on 2nd of June 2017 04:38:28 PM UTC
+#This file was last reorganized on 9th of June 2017 07:00:00 AM UTC
 
 $text['language-name']['en-us'] = "English - United States";
 $text['language-name']['ar-eg'] = "العربية - مصر";
@@ -181,6 +181,26 @@ $text['message-copy']['ru-ru'] = "Копирование выполнено";
 $text['message-copy']['sv-se'] = "Kopiering Slutförd";
 $text['message-copy']['uk-ua'] = "Скопійовано";
 
+$text['message-invalid_credentials']['en-us'] = "Invalid Username and/or Password";
+$text['message-invalid_credentials']['ar-eg'] = "";
+$text['message-invalid_credentials']['de-at'] = "";
+$text['message-invalid_credentials']['de-ch'] = "";
+$text['message-invalid_credentials']['de-de'] = "";
+$text['message-invalid_credentials']['es-cl'] = "";
+$text['message-invalid_credentials']['es-mx'] = "";
+$text['message-invalid_credentials']['fr-ca'] = "";
+$text['message-invalid_credentials']['fr-fr'] = "";
+$text['message-invalid_credentials']['he-il'] = "";
+$text['message-invalid_credentials']['it-it'] = "";
+$text['message-invalid_credentials']['nl-nl'] = "";
+$text['message-invalid_credentials']['pl-pl'] = "";
+$text['message-invalid_credentials']['pt-br'] = "";
+$text['message-invalid_credentials']['pt-pt'] = "";
+$text['message-invalid_credentials']['ro-ro'] = "";
+$text['message-invalid_credentials']['ru-ru'] = "Неверное имя пользователя или пароль";
+$text['message-invalid_credentials']['sv-se'] = "";
+$text['message-invalid_credentials']['uk-ua'] = "";
+
 $text['message-message']['en-us'] = "Message";
 $text['message-message']['ar-eg'] = "";
 $text['message-message']['de-at'] = "Nachricht";
diff --git a/resources/check_auth.php b/resources/check_auth.php
index 1e48c628f8..bc7b2fc0a4 100644
--- a/resources/check_auth.php
+++ b/resources/check_auth.php
@@ -26,7 +26,11 @@
 //includes
 	require_once "resources/require.php";
 
-//for compatability require this library if less than version 5.5
+//add multi-lingual support
+	$language = new text;
+	$text = $language->get('resources');
+
+//for compatibility require this library if less than version 5.5
 	if (version_compare(phpversion(), '5.5', '<')) {
 		require_once "resources/functions/password.php";
 	}
@@ -55,8 +59,7 @@
 		//if the username is not provided then send to login.php
 			if (strlen($_REQUEST["username"]) == 0 && strlen($_REQUEST["key"]) == 0) {
 				$target_path = ($_REQUEST["path"] != '') ? $_REQUEST["path"] : $_SERVER["REQUEST_URI"];
-				$_SESSION["message_mood"] = "negative";
-				$_SESSION["message"] = "Invalid Username and/or Password";
+				messages::add($text['message-invalid_credentials'], 'negative');
 				header("Location: ".PROJECT_PATH."/login.php?path=".urlencode($target_path));
 				exit;
 			}
@@ -97,8 +100,7 @@
 					closelog();
 				//redirect the user to the login page
 					$target_path = ($_REQUEST["path"] != '') ? $_REQUEST["path"] : $_SERVER["PHP_SELF"];
-					$_SESSION["message_mood"] = "negative";
-					$_SESSION["message"] = "Invalid Username and/or Password";
+					messages::add($text['message-invalid_credentials'], 'negative');
 					header("Location: ".PROJECT_PATH."/login.php?path=".urlencode($target_path));
 					exit;
 			}