diff --git a/htdocs/core/class/translate.class.php b/htdocs/core/class/translate.class.php
index 3769abc6669..321debc5644 100644
--- a/htdocs/core/class/translate.class.php
+++ b/htdocs/core/class/translate.class.php
@@ -1,6 +1,6 @@
 <?php
 /* Copyright (C) 2001      Eric Seigne         <erics@rycks.com>
- * Copyright (C) 2004-2010 Destailleur Laurent <eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2012 Destailleur Laurent <eldy@users.sourceforge.net>
  * Copyright (C) 2005-2010 Regis Houssin       <regis@dolibarr.fr>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -40,9 +40,9 @@ class Translate {
 	var $charset_output='UTF-8';	// Codage used by "trans" method outputs
 
 	var $tab_translate=array();		// Array of all translations key=>value
-	var $tab_loaded=array();		// Array to store result after loading each language file
+	private $_tab_loaded=array();	// Array to store result after loading each language file
 
-	var $cache_labels=array();		// Cache for labels return by trans method
+	var $cache_labels=array();		// Cache for labels return by getLabelFromKey method
 
 
 
@@ -179,7 +179,7 @@ class Translate {
 		}
 
         // Check cache
-		if (! empty($this->tab_loaded[$newdomain]))	// File already loaded for this domain
+		if (! empty($this->_tab_loaded[$newdomain]))	// File already loaded for this domain
 		{
 			//dol_syslog("Translate::Load already loaded for newdomain=".$newdomain);
 			return 0;
@@ -314,9 +314,9 @@ class Translate {
 
 		if ($alt == 2)
 		{
-			if ($fileread) $this->tab_loaded[$newdomain]=1;	// Set domain file as loaded
+			if ($fileread) $this->_tab_loaded[$newdomain]=1;	// Set domain file as loaded
 
-			if (empty($this->tab_loaded[$newdomain])) $this->tab_loaded[$newdomain]=2;           // Marque ce fichier comme non trouve
+			if (empty($this->_tab_loaded[$newdomain])) $this->_tab_loaded[$newdomain]=2;           // Marque ce fichier comme non trouve
 		}
 
 		// Check to be sure that SeparatorDecimal differs from SeparatorThousand