bug #385 compatibility with PHP7

* replace old-style constructor with PHP5-style constructor (__construct)
* do not call set_magic_quotes_runtime() any longer
* avoid automatic conversion from array to string

admin/include/languages.class.php

@@ -30,7 +30,7 @@ class languages
   /**
    * Initialize $fs_languages and $db_languages
   */
-  function languages($target_charset = null)
+  function __construct($target_charset = null)
   {
     $this->get_fs_languages($target_charset);
   }
@@ -408,4 +408,4 @@ UPDATE '.USER_INFOS_TABLE.'
     return strcmp(strtolower($a['extension_name']), strtolower($b['extension_name']));
   }
 }
-?>
+?>