Fixed A11y Video Block Issue

[Molochem]

fixes #5731
Fixed the missing aira-label on Video-Blocks

It seems a bit hacky, and also im not sure about the Message Content. Suggestions are welcome.

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[Molochem]

Just for the Record , some Tests are flaky. Idid nothing to the actual code, just changed the News fragment. Suddenly all Checks pass ?

[stevepiercy]

News is good, but the rest needs review by a core contributor.

News only

[sneridagh]

LGTM, @ichim-david could you give your blessing here?

[ichim-david]

@Molochem @sneridagh it's a small improvement from "Group main" to "Play Video".
My problem right now is that ok we say Play Video but if you hit enter or spacebar there is no video playback.
It's not a button to access and play the video.
You have to click on the placeholder image to then get the youtube embed as seen in this demo
https://demo.plone.org/video-block
EDIT: Even then you don't get to play video because you will have to interact with the video play
out of the embed and that will determine how many more tabs or enter or spacebar taps are necessary
in order to get to play the video.

I would rather say something along the lines "Video embed placeholder image".
The video block needs improvement, you can't access it with the keyboard so I don't really understand why we
have the tabindex=0 on it.

All of this could be improvement with other tickets but I'm a bit -1 on this idea because you don't Play video
using the keyboard anyhow.
I'll try to research some accessible placeholder / embed video players and see what others have tried and come back with a more proper suggestion.

[ichim-david]

@Molochem @sneridagh
https://adrianroselli.com/2024/01/embed-slides-youtube-videos-and-more.html#YouTube
If you search for:
The bulk of that code is the SVG play button and its focus & hover styles. You can make something simpler if you wish.
Below it is a placeholder image with a button on top that says: "Play Video".
As soon as you press it, the embed is loaded and video starts playback.
This is the correct pattern to me to signal "Play Video", that of a button that when you trigger it you get a video playback.