fab-manager/app/frontend/templates/admin/settings/select-multiple.html

<form class="{{classes}}" name="settingSelectMultipleForm">
    <div class="form-group">
        <label for="setting-{{setting.name}}" class="control-label m-r" translate>{{ label }}</label>
        <select class="form-control"
              id="setting-{{setting.name}}"
              ng-model="selection"
              ng-required="required"
              ng-options="opt for opt in options"
              multiple>
        </select>
    </div>
    <div>
        <button ng-click="removeItem()" class="btn btn-default"><i class="fa fa-trash"></i></button>
        <button ng-click="addItem()" class="btn btn-default"><i class="fa fa-plus"></i></button>
    </div>
  <button name="button" class="btn btn-warning m-t" ng-click="save(setting)" ng-disabled="settingSelectMultipleForm.$invalid" translate>{{ 'app.shared.buttons.save' }}</button>
</form>

<script type="text/ng-template" id="newSelectOption.html">
    <div>
        <div class="modal-header">
            <h3 class="modal-title" translate>{{ titleNew }}</h3>
        </div>
        <div class="modal-body">
            <p class="alert alert-info" ng-show="descriptionNew" ng-bind-html="descriptionNew | translate"></p>
            <form class="row m-md" name="newSelectOptionForm">
                <input type="text" class="form-control" ng-model="value" required>
            </form>
        </div>
        <div class="modal-footer">
            <button class="btn btn-warning" ng-disabled="newSelectOptionForm.$invalid" ng-click="ok()" translate>{{ 'app.shared.buttons.confirm' }}</button>
            <button class="btn btn-default" ng-click="dismiss()" translate>{{ 'app.shared.buttons.cancel' }}</button>
        </div>
    </div>
</script>