[Mediawiki-i18n] Some new and replaced messages

[Jimmy Collins]

Hi all,

time to resuscitate this list. Following you find some newly added or changed messages:

added:
+'deadendpagestext' => 'The following pages do not link to other pages in this wiki.',
+'lonelypagestext' => 'The following pages are not linked from other pages in this wiki.',

replaced:
-'lastmodifiedby' => 'This page was last modified $1 by $2.',     // $1 datetime $2 user
+'lastmodifiedatby' => 'This page was last modified $2, $1 by $3.',     // $1 date, $2 time. $3 user
-'lastmodified' => 'This page was last modified $1.',    // $1 datetime $2 user
+'lastmodifiedat' => 'This page was last modified $2, $1.',       //$1 date, $2 time