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docs/guide-ja/start-gii.md added [ci skip]

- small changes to docs/guide-ja/start-forms.md [ci skip]
- docs/guide-ja/start-databases.md added [ci skip]

close #5750

close #5751

Fixes #5735: Added `yii\bootstrap\Tabs::renderTabContent` to support manually rendering tab contents

Fixes #5708

New Chinese translations

[skip ci] New file Ukrainian translation

update caching-data.md [skip ci]

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