BookStack/resources/lang/en/auth.php

<?php
return [
    /*
    |--------------------------------------------------------------------------
    | Authentication Language Lines
    |--------------------------------------------------------------------------
    |
    | The following language lines are used during authentication for various
    | messages that we need to display to the user. You are free to modify
    | these language lines according to your application's requirements.
    |
    */
    'failed' => 'These credentials do not match our records.',
    'throttle' => 'Too many login attempts. Please try again in :seconds seconds.',

    /**
     * Email Confirmation Text
     */
    'email_confirm_subject' => 'Confirm your email on :appName',
    'email_confirm_greeting' => 'Thanks for joining :appName!',
    'email_confirm_text' => 'Please confirm your email address by clicking the button below:',
    'email_confirm_action' => 'Confirm Email',
    'email_confirm_send_error' => 'Email confirmation required but the system could not send the email. Contact the admin to ensure email is set up correctly.',
    'email_confirm_success' => 'Your email has been confirmed!',
    'email_confirm_resent' => 'Confirmation email resent, Please check your inbox.',
];