zulip/templates/zerver/invite_user.html

<div class="modal hide" id="invite-user" tabindex="-1" role="dialog"
     aria-labelledby="invite-user-label" aria-hidden="true">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
    <h3 id="invite-user-label">Invite coworkers to {{product_name}}</h3>
  </div>
  <form id="invite_user_form" class="form-horizontal"
        action="/json/invite_users" method="POST">{% csrf_token %}
    <div class="modal-body">
      <div class="control-group">
        <div id="invite-result"></div>
        <label class="control-label" for="invitee_emails">Emails (one on each line or comma-separated)</label>
        <div class="controls">
          <textarea rows="2" id="invitee_emails"
                    name="invitee_emails"
                    placeholder="One or more email addresses..."></textarea>
        </div>
      </div>
        <div class="alert" id="invite_status"></div>
      <div class="control-group">
        <label class="control-label" for="streams_to_add">Streams they should join</label>
        <div class="controls" id="streams_to_add"></div>
      </div>
    </div>
    <div class="modal-footer">
      <button class="btn btn-default" data-dismiss="modal" aria-hidden="true">Cancel</button>
      <button id="submit-invitation" class="btn btn-primary" data-loading-text="Inviting..." type="submit">Invite</button>
    </div>
  </form>
</div>