MDL-50430 forum: Add number of subscribers to forum subscriber list

mod/forum/lang/en/deprecated.txt

@@ -0,0 +1 @@
+subscribersto,mod_forum

mod/forum/lang/en/forum.php

@@ -462,7 +462,7 @@
 $string['subscribed'] = 'Subscribed';
 $string['subscribenone'] = 'Unsubscribe everyone from this forum';
 $string['subscribers'] = 'Subscribers';
-$string['subscribersto'] = 'Subscribers to \'{$a}\'';
+$string['subscriberstowithcount'] = 'Subscribers to "{$a->name}" ({$a->count})';
 $string['subscribestart'] = 'Send me notifications of new posts in this forum';
 $string['subscribestop'] = 'I don\'t want to be notified of new posts in this forum';
 $string['subscription'] = 'Subscription';
@@ -518,3 +518,6 @@
 $string['yournewquestion'] = 'Your new question';
 $string['yournewtopic'] = 'Your new discussion topic';
 $string['yourreply'] = 'Your reply';
+
+// Deprecated since Moodle 3.0.
+$string['subscribersto'] = 'Subscribers to "{$a->name}"';

mod/forum/renderer.php

@@ -124,7 +124,10 @@ public function subscriber_overview($users, $forum , $course) {
         } else {
             $cm = $modinfo->instances['forum'][$forum->id];
             $canviewemail = in_array('email', get_extra_user_fields(context_module::instance($cm->id)));
-            $output .= $this->output->heading(get_string("subscribersto","forum", "'".format_string($forum->name)."'"));
+            $strparams = new stdclass();
+            $strparams->name = format_string($forum->name);
+            $strparams->count = count($users);
+            $output .= $this->output->heading(get_string("subscriberstowithcount", "forum", $strparams));
             $table = new html_table();
             $table->cellpadding = 5;
             $table->cellspacing = 5;