Merge branch '12606-carto-node' into 12673-static

lib/assets/core/javascripts/cartodb3/carto-node/lib/clients/public.js

@@ -29,11 +29,11 @@ class PublicClient {
   }
 
   makeRelativeURI (parts) {
-    return '/' + parts.join('/');
+    return `/${parts.join('/')}`;
   }
 
   makeAbsoluteURI (relativeURI) {
-    return this.apiURI + relativeURI;
+    return `${this.apiURI}${relativeURI}`;
   }
 
   successCallback (callback) {