Misago/emberapp/app/templates/error-0.hbs

<div class="error-page error-0">
  <div class="container">
    <div class="error">

      <div class="error-icon">
        <i class="material-icons">sync_problem</i>
      </div>

      <div class="error-message">
        <p class="lead">{{gettext "Lost connection with server."}}</p>
      </div>

    </div>
  </div>
</div>