Refactor user session handling and permissions management

- Updated session variables to use 'authorization' array instead of 'username' for user identification across multiple files.
- Introduced a new function `getUserPermissions` to consolidate user permissions retrieval based on assigned roles.
- Modified API calls to use the new authorization structure and updated endpoints to v2.
- Enhanced language support by adding 'PL' to the list of supported languages.
- Cleaned up redundant code and improved session management during user login and registration processes.
- Added a new API endpoint for fetching user permissions based on user ID.

register.php

@@ -32,12 +32,10 @@ if (isset($_POST['register'])){
   $register = $_POST;
   //GET USERKEY
   $data = json_encode(array("username" => interface_user, "password" => interface_pw), JSON_UNESCAPED_UNICODE);
-  //Secure data
-  $payload = generate_payload($data);
   //API call
-  $responses = ioServer('/v1/authorization', $payload);
+  $responses = ioServer('/v2/authorization', $data);
   //Decode Payload
-  if (!empty($responses)){$responses = decode_payload($responses);}else{$responses = '400';}
+  if (!empty($responses)){$responses = json_decode($responses,true);}else{$responses = '400';}
   
   if ($responses === 'NOK' || $responses === '400'){
     //Not allowed
@@ -47,7 +45,7 @@ if (isset($_POST['register'])){
     // Start a new session
     session_start();    
     // Store data in session
-    $_SESSION['userkey'] = $responses->userkey;
+    $_SESSION['authorization']['userkey'] = $responses['userkey'];
     // GET ALL POST DATA
     $data = json_encode($register, JSON_UNESCAPED_UNICODE);
     // Secure data