Edit

Editing: captcha.js

(function ($) {
    "use strict";

window.captcha_src = function (callback) {

$.ajax({
            url: '/captcha/create',
            type: 'post',
            cache: false,
            timeout: 30000,
            success: function (data) {
                if (data.status == 'success') {
                    if (callback) {
                        callback(data.captcha_src);
                    }
                } else {
                    callback(false);
                }
            }
        });
    };

if ($('#captchaImageComment').attr("src") === '') {
        refreshCaptcha();
    }

$('body').on('click', '#refreshCaptcha', function (e) {
        e.preventDefault();
        refreshCaptcha();
    });
})(jQuery);

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