User blog comment:DaNASCAT/Technical Update: August 15, 2016/@comment-24053170-20160816052102/@comment-126761-20160816131738

We're only removing the link to the http://infoboxpreview.appspot.com/ tool, which was not frequently used, not actively maintained and is not translated. I will check with the team to see if there's a timeline on retiring the external site as well.