docs/guide-ja/README.md - ｢ログ｣でなく「ロギング」  [ci skip]
docs/guide-ja/db-dao.md - prepared for translation [ci skip]
Merge branch 'master' of github.com:yiijan/yii2-i18n-ja into yiijan-master
docs/guide-ja/structure-filters.md - revised [ci skip]
docs/guide-ja/structure-widgets.md - revised [ci skip]