clarify all "Invalid uuid" messages by making each unique

website/server/libs/baseModel.js

@@ -12,7 +12,7 @@ export default function baseModel (schema, options = {}) {
       _id: {
         $type: String,
         default: uuid,
-        validate: [v => validator.isUUID(v), 'Invalid uuid.'],
+        validate: [v => validator.isUUID(v), 'Invalid uuid in baseModel.'],
       },
     });
   }