Removing internal references to the EXT constant.  Additionally, marked the constant as deprecated.  Use ".php" instead. Also adding upgrade notes from 2.0.2 to 2.0.3.
diff --git a/system/core/Lang.php b/system/core/Lang.php
index cdadc7f..170e6c7 100644
--- a/system/core/Lang.php
+++ b/system/core/Lang.php
@@ -51,14 +51,14 @@
 	 */
 	function load($langfile = '', $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')
 	{
-		$langfile = str_replace(EXT, '', $langfile);
+		$langfile = str_replace('.php', '', $langfile);
 
 		if ($add_suffix == TRUE)
 		{
 			$langfile = str_replace('_lang.', '', $langfile).'_lang';
 		}
 
-		$langfile .= EXT;
+		$langfile .= '.php';
 
 		if (in_array($langfile, $this->is_loaded, TRUE))
 		{