MDL-22054 converting block name strings to pluginname

AMOS START
 MOV [blockname,block_online_users],[pluginname,block_online_users]
AMOS END

blocks/online_users/block_online_users.php

@@ -7,7 +7,7 @@
  */
 class block_online_users extends block_base {
     function init() {
-        $this->title = get_string('blockname','block_online_users');
+        $this->title = get_string('pluginname','block_online_users');
         $this->version = 2007101510;
     }
 

blocks/online_users/lang/en/block_online_users.php

@@ -23,8 +23,8 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-$string['blockname'] = 'Online Users';
 $string['configtimetosee'] = 'Number of minutes determining the period of inactivity after which a user is no longer considered to be online.';
 $string['online_users:viewlist'] = 'View list of online users';
 $string['periodnminutes'] = 'last {$a} minutes';
+$string['pluginname'] = 'Online Users';
 $string['timetosee'] = 'Remove after inactivity (minutes)';