Do not display expected captcha phrase on failures.

src/application/config/config.php

@@ -273,7 +273,7 @@ $config['cache_path'] = __DIR__ . '/../../storage/cache/';
 | new release.
 |
 */
-$config['cache_busting_token'] = '9sdfg987s8d7g';
+$config['cache_busting_token'] = '9G7D4';
 
 /*
 |--------------------------------------------------------------------------

src/application/controllers/Appointments.php

@@ -438,8 +438,7 @@ class Appointments extends CI_Controller {
                 $this->output
                     ->set_content_type('application/json')
                     ->set_output(json_encode([
-                        'captcha_verification' => FALSE,
-                        'expected_phrase' => $this->session->userdata('captcha_phrase')
+                        'captcha_verification' => FALSE
                     ]));
                 return;
             }

src/assets/js/frontend_book.js

@@ -337,7 +337,7 @@ window.FrontendBook = window.FrontendBook || {};
                 FrontendBookApi.applyPreviousUnavailableDates(); // New jQuery UI version will replace the td elements.
             }, 300); // There is no draw event unfortunately.
         })
-    };
+    }
 
     /**
      * This function validates the customer's data input. The user cannot continue

src/assets/js/frontend_book_api.js

@@ -163,7 +163,7 @@ window.FrontendBookApi = window.FrontendBookApi || {};
 
                 if (response.captcha_verification === false) {
                     $('#captcha-hint')
-                        .text(EALang.captcha_is_wrong + '(' + response.expected_phrase + ')')
+                        .text(EALang.captcha_is_wrong)
                         .fadeTo(400, 1);
 
                     setTimeout(function () {