fix for german umlaute

conlite/includes/functions.general.php

@@ -86,7 +86,7 @@ function is_alphanumeric($test, $umlauts = true)
 {
 
     if ($umlauts == true) {
-        $match = "/^[a-z0-9<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ]+$/i";
+        $match = "/^[a-z0-9ÄäÖöÜüß ]+$/i";
     } else {
         $match = "/^[a-z0-9 ]+$/i";
     }