Part of bug 6702, "Default system messages should be improved". Suggested by Michael De La Rue.
'loginsuccesstitle' => 'Login successful',
'loginsuccess' => "'''You are now logged in to {{SITENAME}} as \"\$1\".'''",
'nosuchuser' => 'There is no user by the name "$1".
-Check your spelling, or create a new account.',
+Check your spelling, or [[Special:Userlogin/signup|create a new account]].',
'nosuchusershort' => 'There is no user by the name "<nowiki>$1</nowiki>".
Check your spelling.',
'nouserspecified' => 'You have to specify a username.',