diff --git a/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/langs/lang.class.php b/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/langs/lang.class.php
index be72012..c04002c 100644
--- a/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/langs/lang.class.php
+++ b/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/langs/lang.class.php
@@ -55,7 +55,7 @@ function getDir() {
 	// constructor
 	function PLUG_Lang( $lang = '' ) {
 		$langs = array('cs','da','de','en','es','fr','it','nl','pl','pt_br','sk');
-		if(!in_array($lang, $langs)) die('invalid language set');
+		if(!in_array($lang, $langs)) $lang = 'en';
 		global $cfg;
 		if ( $lang == '' ) {
 			$this -> lang = $cfg['lang'];
diff --git a/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/scripts/Init.inc.php b/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/scripts/Init.inc.php
index bc783a8..013286a 100644
--- a/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/scripts/Init.inc.php
+++ b/lib/tinymce/jscripts/tiny_mce/plugins/ibrowser/scripts/Init.inc.php
@@ -35,7 +35,7 @@
 if (isset($user)) {
 	// User is logged in
 	$init['user'] = $user->getUsername();
-	$init['lang'] = String::substr(AppLocale::getLocale(), 0, 2);
+	$init['lang'] = getLocaleCode(AppLocale::getLocale());
 	$init['baseUrl'] = Config::getVar('general', 'base_url');
 	$init['baseDir'] =  $baseDir;
 
@@ -51,4 +51,20 @@
 	$init['captchaPath'] = null;
 }
 
+function getLocaleCode($appLocale) {
+	switch ($appLocale) {
+		case 'cs_CZ': return 'cs';
+		case 'da_DK': return 'da';
+		case 'de_DE': return 'de';
+		case 'en_US': return 'en';
+		case 'es_ES': return 'es';
+		case 'fr_CA': return 'fr';
+		case 'it_IT': return 'it';
+		case 'nl_NL': return 'nl';
+		case 'pt_BR':
+		case 'pt_PT': return 'pt_br';
+		default: return 'en';
+	}
+}
+
 ?>