Update BaseArrayHelper.php
Update intro-yii.md in guide-es [skip ci]
Add the `advanced-app-configs.png` image file for tutorial docs/guide-ru/tutorial-advanced-app.md
Merge pull request #6669 from Aviator-Coding/patch-1

Update BaseArrayHelper.php
Merge pull request #6670 from pana1990/guide-es

Update intro-yii.md in guide-es [skip ci]
docs/guide-ja/rest-resources.md - WIP [ci skip]
docs/guide-ja/rest-resources.md - completed [ci skip]
docs/internals-ja/core-code-style.md - updated [ci skip]
Merge pull request #6675 from softark/docs-guide-ja-rest-resources

Docs guide ja rest resources [ci skip]
docs/guide-ja/rest-controllers.md - WIP [ci skip]
docs/guide-ja/rest-controllers.md - completed [ci skip]
Merge pull request #6676 from softark/docs-guide-ja-rest-controllers

Docs guide ja rest controllers [ci skip]
Added phpdoc description for BaseListView and ListView classes
Added ListView description to data widgets guide
Fixed "jQuery UI" case in docs
Elaborated on processing data in background in performance tuning guide
There's no security helper and the component is already described
Guide to pagination
Guide to sorting
Fixes #6678: `yii\behaviors\SluggableBehavior` will generate a new slug only when the slug attribute is empty or the source attribute is changed