Problems if the json-message contains special characters like german …

…umlauts (äöü). Commit should fix that problem.

core/json_api.php

@@ -36,7 +36,7 @@
  */
 function json_url( $p_url, $p_member = null ) {
 	$t_data = url_get( $p_url );
-	$t_json = json_decode( $t_data );
+	$t_json = json_decode( utf8_encode($t_data) );
 
 	if( is_null( $p_member ) ) {
 		return $t_json;