docs/guide-ja/structure-assets.md - revised [ci skip]
docs/guide-ja/README.md - changed the title of the guide [ci skip]
docs/guide-ja/structure-filters.md - revised [ci skip]
docs/guide-ja/structure-widgets.md - revised [ci skip]
docs/guide-ja/README.md - ｢ログ｣でなく「ロギング」  [ci skip]