Fixes #2544: Changed `DetailView`'s `name:format:label` to `attribute:format:label` to match `GridView`

added a missing argument

Fixes #2527: Source language for `app` message category was always `en` no matter which application `sourceLanguage` was used

Pjax inserts the response HTML into the container, it doesn't replace it.
So any subsequent pjax requests duplicate the container.

Fixes #2392: Added `addCssStyle()`, `removeCssStyle()`, `cssStyleFromArray()` and `cssStyleToArray()` to `Html`

fixes #2519: MessageSource removed translation messages when event handler
was bound to `missingTranslation`-event

Fixes #2491: Added support for using the same base class name of search model and data model in Gii [skip ci]