[#122] Handle description field naming in MS API

To create a new organization you need to send

{
    "Name": "Test org",
    "About": "Longer description",
    ...
}

but when getting the metadata of an organization you get:

{
    "Title": "Test org",
    "Description": "Longer description",
    ...
}
[#111] Safer key accessing for dataset and resource metadata