Captcha question stray div end tag and does not use label value

There is a stray div end tag in captcha question in includes/antibot-subscription.php

85:  echo '</div>';

And a parameter $submit_label is available where antibot subscription / unsubscription files are included but it is not used for the button:

95:  echo '<input type="button" value="&gt;" onclick="go(); return false;">';

Also "Open Sans" font is used in CSS but not included/available.

Maybe you could consider to add way to change the appearance of captcha question e.g. button color?

And maybe mention in captcha feature description that captcha display will be skipped alltogether if a user is logged in in WordPress.

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