Suggest improvements

Hello developer. I want to suggest you 2 easy improvements for make this plugin small comfortable.
1. Add “back” button when captcha is incorrect. Yes I know whant you think – browsers have Back button. but for best user expiriens you must have back button in site xD.
you can add this button just add arguments in wordpress api:
chage all youur calls of wp_die
from: wp_die( __('Captcha confirmation error!', 'captcha-code-authentication' ));
to: wp_die( __('Captcha confirmation error!', 'captcha-code-authentication' ), "", ['back_link'=>1] );

2. on wp_login page your captcha don’t protect from bots bruteforce, because now it only check correct code, but dot’t stop process to check inputed login and password.
I think you need change your include_ctl_captcha_login_errors function and do captcha checking before wp engine check login/password and stop process if captcha is incorrect.

Thank you.