API Use new class_description configuration (#610)

Author: GuySartorelli

lang/en.yml

@@ -81,6 +81,7 @@ en:
     db_Protocol: Protocol
     has_one_Subsite: Subsite
   SilverStripe\Subsites\Pages\SubsitesVirtualPage:
+    CLASS_DESCRIPTION: 'Displays the content of a page on another subsite'
     DESCRIPTION: 'Displays the content of a page on another subsite'
     OverrideNote: 'Overrides inherited value from the source'
     PLURALNAME: 'Subsites Virtual Pages'

src/Pages/SubsitesVirtualPage.php

@@ -21,11 +21,15 @@
 
 class SubsitesVirtualPage extends VirtualPage
 {
-
     private static $table_name = 'SubsitesVirtualPage';
 
+    /**
+     * @deprecated 5.4.0 use class_description instead.
+     */
     private static $description = 'Displays the content of a page on another subsite';
 
+    private static $class_description = 'Displays the content of a page on another subsite';
+
     private static $db = [
         'CustomMetaTitle' => 'Varchar(255)',
         'CustomMetaKeywords' => 'Varchar(255)',