Increase timeout on retrieving data

[Mindavi]

The endpoint can be slow, thus exceeding the default timeout of 10 seconds in OkHttp/Retrofit. This will result in the app looking like it's endlessly retrieving data.

Steps to take:

1. Increase timeout
2. Give better feedback to the user about e.g. socket timeouts/exceptions

[Mindavi]

Fixed in d081832. Not sure if it's long enough now, but lately the endpoint seems to respond quicker anyway. Closing as fixed.

[Mindavi]

There is better user feedback now too. It's kind of technical, but better than showing that you're retrieving data while you're not.