'authManager' => [
            'class' => 'yii\rbac\DbManager',
            'itemTable' => '{{%system_rbac_item}}',
            'itemChildTable' => '{{%system_rbac_item_child}}',
            'assignmentTable' => '{{%system_rbac_assignment}}',
            'ruleTable' => '{{%system_rbac_rule}}',
            'defaultRoles' => ['guest']
        ],
 'i18n' => [
            'translations' => [
                '*' => [
                    'class' => 'yii\i18n\DbMessageSource',
                    'sourceLanguage' => 'en-US',
                    'sourceMessageTable' => '{{%language_source}}',
                    'messageTable' => '{{%language_translate}}',
                    'forceTranslation' => true,
                    'cachingDuration' => 86400,
                    'enableCaching' => true,
                ],

            ],
        ],