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.

reset.php

@@ -62,12 +62,10 @@ if ($_POST['submit'] === 'Reset' && $_POST['username'] !='EMP-updater') {
   // Validate credentials
   if (empty($username_err)){
     $data = json_encode(array("username" => $username, "resetkey" => ''), 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);}else{$responses = '400';}   
     
       if ($responses === 'NOK'){
           $username_err = $password_err_1 ?? 'Not authorized, please retry';
@@ -107,11 +105,9 @@ if (isset($_POST['resetkey']) && $_POST['resetkey'] !='' && $_POST['password_upd
           else {
             //UPDATE PASSWORD
             $data = json_encode(array("password" => $password, "resetkey" => $resetkey), JSON_UNESCAPED_UNICODE);
-            //Secure data
-            $payload = generate_payload($data);
             //API call
-            $responses = ioServer('/v1/authorization', $payload);
-            if (!empty($responses)){$responses = decode_payload($responses);}else{$responses = '400';}   
+            $responses = ioServer('/v2/authorization', $data);
+            if (!empty($responses)){$responses = json_decode($responses);}else{$responses = '400';}   
       
                 if ($responses === 'NOK'){
                     $username_err = $password_err_1 ?? 'Not authorized, please retry';