Minor - Initialize var to avoid notice

main/inc/lib/plugin.class.php

@@ -324,6 +324,7 @@ class Plugin
             //1. Loading english if exists
             $english_path = $root.$plugin_name."/lang/english.php";
             if (is_readable($english_path)) {
+                $strings = array();
                 include $english_path;
                 $this->strings = $strings;
             }