Fixes #5688: Added optional `$formName` to `Model::loadMultiple()` to support customizing form name directly

Fixes #5768: When setting `data-confirm` attribute to a submit button, clicking on the button would not trigger form submission

docs/guide-ja/structure-filters.md added [ci skip]

docs/guide/structure-filters.md - typo fixed [ci skip]

Fixes #4889: Application was getting into redirect loop when user wasn't allowed accessing login page. Now shows 403

Fixes #5954: `yii message` command now shows user friendly error if it's not able to parse source file

Fixed typos [ci skip] in console tutorial

Fixes #5865: Added info about adjusting advanced application in order to deploy it under a single domain

[skip ci] Fixes to tutorial-performance-tuning

docs/guide-ja/structure-modules.md completed [ci skip]

Add docs/guide-ja/caching-*.md [ci skip]