docs/guide-ja/README.md - updated [ci skip]
docs/guide-ja/db-active-record.md - started translation
docs/guide-ja/README.md - added translation status infos [ci skip]
docs/guide-ja/db-active-record.md - WIP [ci skip]
docs/guide-ja/db-active-record.md - WIP [ci skip]
docs/guide-ja/db-active-record.md - WIP [ci skip]
docs/guide-ja/db-active-record.md - completed [ci skip]
Merge pull request #6417 from softark/docs-guide-ja-db-active-record

/docs/guide-ja/db-active-record.md added [ci skip]
composer: create directory if it does not exists

may happen if yii is installed globally.

fixes #6402