Fix issues with Session Timeout toast

[UsamaHameed]

Expected behavior

The toast should inform users about incoming session timeout.

Actual behavior

• The session timeout works fine.
• Users can disable the timeout setting to stay in session indefinitely.

Issues:

• The styles do not match the design.
• The text should be gramatically correct.
  Warning session timeout --> Warning: Session timeout (without underline)
  Your session will timed out in 2m if no network activity occur --> Your session will be timedout in 2 minutes if no network activity occurs.
• The toast does not disappear when the user gets timed out.

Steps to reproduce

Which version(s) does this affect? (Environment, OS, etc...)