How to cache Database translation messages

I tried to define it like following but not working?




'i18n' => [

            'class' => Zelenin\yii\modules\I18n\components\I18N::className(),

            'languages' => ['en', 'ar', 'fr'],

            'sourceMessageTable' => 'source_message',

            'messageTable' => 'message',

            'cache' => 'cache'


        ],

May be you should enable caching http://www.yiiframework.com/doc-2.0/yii-i18n-dbmessagesource.html#$enableCaching-detail