As a Watchist Expiry user, I want the success message to be updated when I watch via action=watch, so that I can confirm that the time period I selected is accurate.
Acceptance Criteria:
- Add same success message for action=watch as seen on other pages when user watches temporarily ("XX and its discussion page have been added to your watchlist for XX.")
Visual Example of Current Behavior for action=watch (we should change this):
Example of what users see when watching via star (for comparison):