MDL-36266 Improve update notification message subject

lang/en/admin.php

@@ -1000,7 +1000,7 @@
 $string['updateavailablenot'] = 'Your Moodle code is up-to-date!';
 $string['updatenotifications'] = 'Update notifications';
 $string['updatenotificationfooter'] = 'Your Moodle site {$a->siteurl} is configured to automatically check for available updates. You are receiving this message as the administrator of the site. You can disable automatic checks for available updates in the Site administration section of the Settings block. You can customize the delivery of this message via your personal Messaging setting in the My profile settings section.';
-$string['updatenotificationsubject'] = 'There are available updates for your Moodle site';
+$string['updatenotificationsubject'] = 'Moodle updates are available ({$a->siteurl})';
 $string['updateautocheck'] = 'Automatically check for available updates';
 $string['updateautocheck_desc'] = 'If enabled, your site will automatically check for available updates for both Moodle code and all additional plugins. If there is a new update available, a notification will be sent to site admins.';
 $string['updateminmaturity'] = 'Required code maturity';

lib/pluginlib.php

@@ -1329,7 +1329,7 @@ protected function cron_notify(array $notifications) {
             $message->name              = 'availableupdate';
             $message->userfrom          = get_admin();
             $message->userto            = $admin;
-            $message->subject           = get_string('updatenotifications', 'core_admin');
+            $message->subject           = get_string('updatenotificationsubject', 'core_admin', array('siteurl' => $CFG->wwwroot));
             $message->fullmessage       = $text;
             $message->fullmessageformat = FORMAT_PLAIN;
             $message->fullmessagehtml   = $html;