Accessibility: better support for tables

[Marek Lewandowski]

We need to bring a better support for the tables.

I've tested JAWS and Narrator and either of them is doing a good job with our tables.

Screen reader notes:

• JAWS - reads each char inside the table as line ending mark, therefore tables content is not available which makes this useless.
• Narrator - it reads the content correctly, but (at least in default configuration) does not notify that user is in the table.

Possible solution:

I belive we should give a try to role=grid for the table.