Update language maintenance files

per
https://gerrit.wikimedia.org/r/#/c/59572/13/languages/messages/MessagesEn.php,unified
https://gerrit.wikimedia.org/r/#/c/61073/4/maintenance/language/messages.inc,unified

Change-Id: I2c863b2a8db5f9b3c7630abb4b843845dbe4fa79