Accessibility of Users landing page

Overview of accessibility issues found on the Users landing page

Status updates are not picked up by screen readers- “User unsuspended”, "User suspended", “User deleted”
Dialog for deleting a user would benefit from role=”dialog and an accessible name
The same dialog does not trap keyboard focus
The remove button that deletes selected user is not keyboard accessible
Label for transferring content to another user might be a bit confusing, it says “transfer to”; my suggestion is to give the radio button the “transfer to another user” label and append the choose user button below the radio buttons
It would also be good to wrap those radio buttons with role=”radiogroup” and associate the legend using aria-labelledby
It’s not possible to select a user that I would like to transfer the content to when using the keyboard only
Checkboxes in the thumbnail view should have role=”checkbox” and aria-checked; it’s also a bit confusing that they can be navigated using arrow keys only; I think that it would be better if each of them was a Tab stop
Icons for user status (e.g "Active") should have a text alternative and they should not rely on colour perception only
Edit user pop-up would benefit from role=”dialog” and an accessible name
Error message for missing the required field in the edit pop-up not communicated to screen reader users; my suggestion is to move keyboard focus to the incorrect field and associate the error message with the input using aria-describedby
Username field in the edit user popup would benefit from the required attribute