Add icons to the message statuses

[cehfisher]

Making a stand-alone ticket to tackle this accessibility issue.

From @fuzzbomb:

The message status (error, warning, info) are currently distinguished by colour alone. Icons would be the easiest solution here. I really like the full-width background, that could help draw attention to the message area.

From @kjays:

@thamas has done some work on this and simultaneously I did similar work but using the same link styles as the body area with colour variations. I need to re-implement my work for the links only since they conflicted on merge

[thamas]

@cehfisher It was done by #48

I checked again, icons are displayed, but link style has changed.

I close it but feel free to reopen if you see something to be done.

[thamas]

Output generated by styleguide module:

[cehfisher]

Thanks for checking! It sounded like this might have been regressed on the last feature branch. Glad it was not. :)

[fuzzbomb]

The icons and underlined links in the screenshot above are the right idea.