openproject/public/templates/work_packages/tabs/watchers.html

<div class="detail-panel-content">
  <div class="detail-panel-watchers">
    <ul>
      <li ng-repeat="user in watchers">
        <img class="avatar" ng-src="{{ user.props.userAvatar }}" />
        <span  class="user"><a ng-href="/users/{{ user.props.id }}" ng-bind="user.props.firstname + user.props.lastname"></a></span>
      </li>
    </ul>
  </div>
</div>