Add missing __str__ methods to the models

frontend/src/setupProxy.js

@@ -10,7 +10,7 @@ module.exports = (app) => {
       '/oidc*', // OpenID connect login endpoint
     ],
     createProxyMiddleware({
-      target: 'http://0.0.0.0:8000',
+      target: 'http://localhost:8000',
       changeOrigin: true,
     })
   )