Accessibility table caption

[brianteeman]

If you look at the generated table caption you will see that it is incomplete

The table headers needs to be replaced with the HTMLHelper as in the core components

If no one does this in the meantime I will try to find the time - if thats ok?

[roland-d]

@brianteeman If you could create a PR for that I would appreciate it.

[brianteeman]

I will put it on my todo