      <label for="max-latency" class="col-sm-12 col-md-4 col-lg-2 col-form-label">
        <span class="lang-field lang-fa">تاخیر مجاز:</span>
        <span class="lang-field lang-en">Max. Latency:</span>
        <span class="lang-field lang-cn">最大延迟：</span>
      </label>
      <div class="col-sm-12 col-md-8 col-lg-2">
        <input class="form-control" type="number" id="max-latency" min="50" max="3000" step="50" value="500">
      </div>
      <label for="protocol" class="col-sm-12 col