Missing widget description for screen readers

[giorgio]

Once created a widget in the text editor, navigating and selecting it using the keyboard, there is no description that notifies the actual presence of it in the editor.

In my example i've created a widget and i've used the loadContent method to have a media content in it.

To test if there was some notification of the widget's presence, i used a screen reader called JAWS, but nothing was notified once the widget was selected.

I'm raising this ticket because i think that is an accessibility service that we have to guarantee.

[Piotrek Koszuliński]

I think it's a DUP of #11700.