[Dev] Investigate session ending countdown timer and accessibility

[thetif]

The session ending alert has a timer that counts down, but it only announces itself when the modal first opens. How should we best handle this? Also, once the session times out, we need to make sure that it announces that they have been logged out.

This task is done when…

This could include:

• [x] a determination has been made for how to handle the countdown for non-sighted users
• [ ] implementation of countdown for non-sighted users
• [ ] implementation of announcement of sign out for non-sighted users

[tbolt]

Re: Determination on how to handle countdown for non-sighted users. We're updating the language to read: "Session Expired. Your session is expiring in X minutes..." Where X counts down every minute and announces it to screen readers. This way we have parity in experience for all.