* ext.confirmEdit.CaptchaInputWidget.js:
Based on code from ve.init.mw.CaptchaSaveErrorHandler.js
* ext.confirmEdit.CaptchaInputWidget.less:
Based on code from mw/ext/VE repo in ve.ui.MWSaveDialog.css
* ConfirmEditHooks.php:
Based on code from mw/ext/VE repo in VisualEditorHooks.php
Change-Id: I6605017fd31a4f96c529dd0beb69e9f4433cebc1
Previously, clicking it would change the image, but the widget would
still expect the user to fill in the original CAPTCHA.
Change-Id: I24a963e760951427f6d233302429c1baf1fb299f