OpenSlides/openslides/core/static/templates/config-form-field.html

<div class="form-group">
  <label>{{ label }}</label>

  <div class="input-group">
    <input ng-if="type != 'choice' && type != 'textarea'" ng-model="value" ng-change="save(configOption.key, value)" id="{{ key }}"
        type="{{ type }}" class="form-control">

    <textarea ng-if="type == 'textarea'" ng-model="value" ng-change="save(configOption.key, value)" id="{{ key }}" class="form-control">

    <select ng-if="type == 'choice'" ng-model="value" ng-change="save(configOption.key, value)" id="{{ key }}"
        class="form-control" ng-options="option.value as option.display_name for option in choices">
    </select>

    <span class="input-group-btn">
      <button ng-click="value=configOption.default_value; save(configOption.key, configOption.default_value)" class="btn btn-default" translate>
        <i class="fa fa-undo"></i>
        <translate>Reset</translate>
      </button>
    </span>
  </div>
  <p ng-if="help_text" class="help-block">{{ help_text }}</p>
</div>