Different placeholder for exactly the same string

[jiehanzheng]

The string

Check your inbox at <strong>[$user_email]</strong> and click the link given.

is logically used twice in wp-signup.php. However, in the first occurrence, $user_email is referred to as "%1$s", whereas in the second occurrence, it is referred to as "%s". And this makes an extra POT translate template entry.

[jiehanzheng]

Changes the first reference to "%s"

[nacin]

In [20556]:

Combine two strings. props jiehanzheng. fixes #20500.