Microdata and RDFa markup does not load (RDF translator app server error)

[PhilReedData]

When visiting the site via http (issue #16) or a modified https (issue #18), the JSON-LD markup will be generated, however, the translations to Microdata and RDFa both fail. The panels fail to load.

The console shows errors:

• Access to XMLHttpRequest at 'http://rdf-translator.appspot.com/convert/json-ld/rdfa/content' from origin 'http://www.macs.hw.ac.uk' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
• Failed to load resource: net::ERR_FAILED
• Access to XMLHttpRequest at 'http://rdf-translator.appspot.com/convert/json-ld/microdata/content' from origin 'http://www.macs.hw.ac.uk' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
• Failed to load resource: net::ERR_FAILED

Visiting the http://rdf-translator.appspot.com site (and the two full paths above) all show Error: Server Error. The service you requested is not available yet. Please try again in 30 seconds. Same visiting the https version. These URLs appear in Web-Application/libs/bioschemas/setup.js, functions jsonldToRDFa(jsonld) and jsonldToMicrodata(jsonld).

Who is responsible for the RDF translator app? Do we need to find a new one, or will a small tweak suffice?