ueForKey === key ? 'fa-check-square' : 'fa-square']" aria-hidden="true"></i>
                                                    </span>
                                                    <span>Old value</span>
                                                </button>
                                            </div>
                                            <div class="control">
                                                <button class="button is-danger" @click="resetValue(key)">Restore old value</