fix translation + upgrade script

eicaptcha.php

@@ -423,7 +423,7 @@ public function hookActionBeforeSubmitAccount($params)
                 Tools::getRemoteAddr()
             );
             if (!$result->isSuccess()) {
-                $this->context->controller->errors[] = Tools::displayError('incorrect response to CAPTCHA challenge. Please try again.');
+                $this->context->controller->errors[] = $this->l('incorrect response to CAPTCHA challenge. Please try again.');
             }
         }
     }

upgrade/install-0.4.16.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * 2007-2019 PrestaShop
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License (AFL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://opensource.org/licenses/afl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
+ * versions in the future. If you wish to customize PrestaShop for your
+ * needs please refer to http://www.prestashop.com for more information.
+ *
+ * @author    Hennes Hervé <contact@h-hennes.fr>
+ * @copyright 2013-2019 Hennes Hervé
+ * @license   http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
+ *  http://www.h-hennes.fr/blog/
+ */
+
+if (!defined('_PS_VERSION_')) {
+    exit;
+}
+
+/**
+ * Install new hook to check captcha on customer account
+ * @param Module $module
+ * @return bool
+ */
+function upgrade_module_0_4_16($module)
+{
+    return $module->registerHook('actionBeforeSubmitAccount');
+}