- prepared for translation [ci skip]
- docs/guide-ja/structure-widgets.md - changed "コンテント" to "コンテンツ" [ci skip]
- docs/guide-ja/* - changed "ドキュメンテーション" to "ドキュメント" [ci skip]
- docs/guide-ja/intro-yii.md - inserted the Chinese character "易" [ci skip]
- docs/guide-ja/structure-assets.md - WIP [ci skip]
- docs/guide-ja/structure-assets.md - completed [ci skip]

close #6037

Fixes #5799: `yii\bootstrap\ButtonGroup::buttons` can take all options that are supported by `yii\bootstrap\Button`

Pass all the button's config array to Button::widget() instead of creating new one item by item. Now allowed to pass in ButtonGroup button's configs any possible attributes(like tagName, encodeLabel, etc).

Rest versioning spanish guide changes and fixes [skip ci]

[skip ci] Spanish guide

More Spanish guide changes and fixes

Typo fix in guide-ru

Fixes #6018: When setting the `encode` option via `yii\widgets\ActiveRecord::errorOptions`, it works the other way around [skip ci]

typo