Update text.php (#4654)

resources/classes/text.php

@@ -103,7 +103,7 @@ class text {
 		//reduce to specific language
 			if ($language_code != 'all') {
 				if (is_array($text)) foreach ($text as $key => $value) {
-					if (strlen($value[$language_code]) > 0) {
+					if (isset($value[$language_code]) && strlen($value[$language_code]) > 0) {
 						$text[$key] = $value[$language_code];
 					}
 					else {