As a watchlist expiry user, I want to view the selected temporary watch period in the success message (after selecting in in the static watch page), so that I can confirm that the correct period has been selected and saved.
This is a followup to {T245565}, since the acceptance criteria for that task didn't include changing the messages.
**Background:** As a user, when I visit https://en.wikipedia.beta.wmflabs.org/w/index.php?title=Main_Page&action=watch and I choose to watch for `1 week.` I hit `Watch.` I should be told that the page has been added to my watchlist for `1 week.` Currently, `addedwatchtext` is defined as `"[[:$1]]" and its discussion page have been added to your [[Special:Watchlist|watchlist]].`
At the end of the sentence, it` The confirmation page should include the duration (`added to your [[Special:Watchilst|watchlist]] indefinitely / for 1 week / for 1 month`). This is a followup to {T245565}, since the acceptance criteria for that task didn't include changing the messagesthe user entered.
**Acceptance Criteria:**
* Update the success message to state the length of time of the watch period
** If permanent or temporary
*** [PAGE NAME] and its talk page have been added to your watchlist.
*** Watchlist Period: [[watch period]]
**Visual Example (current behavior --> this should be modified):**
{F31756782}