mod_vcard_command: a simplistic way to get and set vcard data for registered users
Use "prosodyctl get user@example.com" to print the XML to stdout, and
"prosodyctl set user@example.com /file/name" to set the vcard info from
an xml file.
<tr>
<th>What is {x} {op} {y}?</th><td>
<input name="captcha_challenge" type="hidden" value="{challenge}">
<input name="captcha_reply" pattern="[0-9]+" required type="number">
</td></tr>