Still feels like an incomplete, possibly unnecessary, fragment

Because we’re using capital “Web” not “web” (my previous mistake).

Clarify new usage of yii\web\View::render()

One paragraph description and one code snippet to clarify usage of yii\web\View::render() in a view context, as using echo is a significant change from partial view usage in Yii 1.1.

removed redundant whitespace, related to issue #2978

Update danish translation [skip_ci]

fixes #2989

Improved action filter and action execution flow by supporting installing action filters at controller, module and application levels

Added support to allow an event handler to be inserted at the beginning of the existing event handler list

RBAC: decoupled rules from assignments and items, implemented php manager

removed duplicated joins when using joinWith and via relations

fixes #2650

Fixed UrlManager rules caching

Fixes issue #2978 - JSON MIME type