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.

report_builder.php

@@ -6,13 +6,13 @@ $_SESSION['prev_origin'] = $_SERVER['REQUEST_URI'];
 $page = $_SESSION['origin'] = 'report_builder';
 
 //Check if allowed
-if (isAllowed($page, $_SESSION['profile'], $_SESSION['permission'], 'R') === 0) {
+if (isAllowed($page, $_SESSION['authorization']['profile'], $_SESSION['authorization']['permission'], 'R') === 0) {
     header('location: index.php');
     exit;
 }
 
 // Create bearer token for API calls
-$bearertoken = createCommunicationToken($_SESSION['userkey']);
+$bearertoken = createCommunicationToken($_SESSION['authorization']['userkey']);
 
 // Include settings for baseurl
 include './settings/settings_redirector.php';