muc_notifications: notify non-present members of new messages This module, in the event of a new message in a Group Chat, will generate a notification for each of those members not present at that time in the Group Chat

<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>