- Deprecated `yii\base\BaseObject::className()` in favor of native PHP syntax `::class`, which does not trigger autoloading
- Deprecated XCache and Zend data cache support as caching backends
- Deprecated `yii\BaseYii::powered()` method
- Added `yii\base\InvalidArgumentException` and deprecated `yii\base\InvalidParamException`
- Added `yii\BaseYii::debug()` and deprecated `yii\BaseYii::trace()`
* Corrections dans concept-aliases.md version fr
* Some correction in intro-upgrade-from.md French version
* some corrections in start-databases.md French version
* added translation of structure-applications.md French version
* adding source change in translation of concept-alias.md
* adding source change in translation of intro-upgrade-from-v1.md
* new French translation for struture-filters and some language consistency improvements in structure-views [skip ci]
* reintroducing consistency improv. in structure-views [skip ci]
* added French structure-widgets.md [skip ci]
