buttons: [{
    text: $t('Cancel'),
    class: 'action-secondary action-dismiss',

    /**
     * Click handler.
     */
    click: function (event) {
        this.closeModal(event);
    }
}, {
    text: $t('OK'),
    class: 'action-primary action-accept',

    /**
     * Click handler.
     */
    click: function (event) {
        this.closeModal(event, true);
    }
}]