add state_description

app/views/site_pages/_info.json.jbuilder

@@ -7,6 +7,7 @@ json.project_id page.project_id
 json.site_name page.site_name
 json.theme page.theme
 json.state page.state
+json.state_description page.state_description
 json.language_frame page.language_frame
 json.url page.url
 json.created_at page.created_at.strftime("%Y-%m-%d %H:%M:%S")