Trying to make infusions from v7 work with v9

$locale = fusion_get_locale(); // loads all your current locale to $locale string.
echo fusion_get_locale("SPR011"); // equivalent to $locale['SPR011'];
 // add additional file.php  into the locale cache.
$locale = fusion_get_locale("", LOCALE.LOCALESET."/file.php");
echo $locale['new_file_key']; // you can access additional now.

// Load the current site settings to $settings variable.
$settings = fusion_get_settings();

echo fusion_get_settings("locale"};  // equivalent to $settings['locale']

$userdata = fusion_get_userdata(); // load your account data.
echo fusion_get_userdata("user_name"); 

$other_user = fusion_get_user(6); // load user id 6
print_p($other_user);

<?php
/*-------------------------------------------------------+
| PHPFusion Content Management System
| Copyright © 2002 - 2010 Nick Jones
| http://www.php-fusion.co.uk/
+--------------------------------------------------------+
| Filename: infusion.php
| CVS Version: 1.12
| Author: cmike
| Web: http://freeware.wnet.net.pl
| Email: mike@wnet.net.pl
+--------------------------------------------------------+
| v7 by Diemux
| www.phpfusion-mods.net
+--------------------------------------------------------+
| Bugfixes and Working v7.01.02 by snowballsn
| www.phpfusion-mods.net
+--------------------------------------------------------+
| This program is released as free software under the
| Affero GPL license. You can redistribute it and/or
| modify it under the terms of this license which you
| can read by viewing the included agpl.txt or online
| at www.gnu.org/licenses/agpl.html. Removal of this
| copyright header is strictly prohibited without
| written permission from the original author(s).
+--------------------------------------------------------*/
if (!defined("IN_FUSION")) { die("Access Denied"); }

include INFUSIONS."button_panel/infusion_db.php";

if (file_exists(INFUSIONS."button_panel/locale/".$settings['locale'].".php")) {
   include INFUSIONS."button_panel/locale/".$settings['locale'].".php";
} else {
   include INFUSIONS."button_panel/locale/English.php";
}



// Infusion Information
$inf_title = "Button Panel";
$inf_description = "Button panel with click-counting and login system for clients.";
$inf_version = "1.12";
$inf_developer = "cmike, v7 by Diemux";
$inf_email = "mike@wnet.net.pl";
$inf_weburl = "http://freeware.wnet.net.pl";

// Infusion Paths
$inf_folder = "button_panel";

$inf_adminpanel[1] = array(
   "title" => "Button Panel",
   "image" => "image.gif",
   "panel" => "button_admin.php",
   "rights" => "BUP"
);

// Database Table information : Create database tables.
$inf_newtable[1] = DB_BUTTONS." (
  button_id int(11) NOT NULL auto_increment,
  button_name varchar(250) NOT NULL default '',
  button_pic varchar(200) NOT NULL default '',
  button_link varchar(200) NOT NULL default '',
  button_count int(11) NOT NULL default '0',
  button_user varchar(100) NOT NULL default '',
  button_pass varchar(100) NOT NULL default '',
  PRIMARY KEY  (button_id)
) ENGINE=MyISAM";
   
// Database Table Drop Command : Drop tables if infusion is uninstalled.
$inf_droptable_[1] = DB_BUTTONS;
?>