do not transform response (json) fixes #201

frontend/api/api.js

@@ -195,7 +195,7 @@ const api = {
     return new Promise((resolve, reject) => {
       axios.get('download&path='+encodeURIComponent(Base64.encode(params.path)),
         {
-          transformResponse: undefined,
+          transformResponse: [data => data],
         })
         .then(res => resolve(res.data))
         .catch(error => reject(error))