Set proper context when sending emails (#402)

classes/task/email_certificate_task.php

@@ -84,6 +84,9 @@ class email_certificate_task extends \core\task\scheduled_task {
             // Get the context.
             $context = \context::instance_by_id($customcert->contextid);
 
+            // Set the $PAGE context - this ensure settings, such as language, are kept and don't default to the site settings.
+            $PAGE->set_context($context);
+
             // Get the person we are going to send this email on behalf of.
             $userfrom = \core_user::get_noreply_user();