Translation function includes HTML tag

In the workbench_access_user_form function, the display of the available sections includes a "<br />" tag when generating a string for users who don't have access to the checkboxes.

The problem with this is the tag is included in a string that has the t() function applied to it in the #markup. This causes the tag to be printed rather than applied as HTML, causing results such as "Section 1<br />" to be shown on the page.

I'll post a patch in a moment.