Plugin script tests and PHP8 fixes.

e107_plugins/user/userlanguage_menu.php

@@ -16,8 +16,8 @@
 //TODO homogenisation with languagelinks + do not force www + unobtrusive redirect
 if ( ! defined('e107_INIT')) { exit(); }
 
-require_once(e_HANDLER.'language_class.php');
-$slng = new language;
+e107::plugLan('user', null);
+$slng = e107::getLanguage();
 
 $languageList = explode(',', e_LANLIST);
 sort($languageList);

e107_plugins/user/usertheme_menu_config.php

@@ -66,6 +66,8 @@ if (isset($_POST['update_theme']))
 	}
 }
 
+$themeList = array();
+
 if (isset($pref['allowed_themes']))
 {
 	$allThemes = FALSE;