Spanish guide Query Builder
Merge pull request #6532 from larnu/spanish_docs

Spanish guide Query Builder [skip ci]
Adds immutable property fit SluggableBehavior fixes #6430
Fixes #6434: Added `yii\behaviors\SluggableBehavior::immutable` to support keeping the generated slug unchanged
他のフレームワークでは連結テーブルより中間テーブルと訳すことが多い
「ベストプラクティス」は日本語で通じると思います
docs/guide-ja/ - changed "最善の慣行" to "ベストプラクティス" [ci skip]
docs/guide-ja - changed "慣行" to "プラクティス" [ci skip]
docs/guide-ja/README.md - updated [ci skip]
docs/guide-ja/db updated [ci skip]
docs/guide-ja/README.md - updated [ci skip]
docs/guide-ja/input-file-upload.md - added [ci skip]
typo [ci skip]
Merge pull request #6541 from softark/docs-guide-ja-inpt-file-upload

/docs/guide-ja/input-file-upload.md added [ci skip]
docs/guide/input-file-upload.md - revised a bit [ci skip]
Merge pull request #6543 from softark/docs-guide-input-file-upload-revised

docs/guide/input-file-upload.md - revised a bit [ci skip]