OpenAtlas

Implementation on the backend complete.
@Christoph Hoffmann: I included a download button image from https://icons.getbootstrap.com/, which is under MIT license. I don't know if we have other buttons available through bootstrap. Can you make it beautiful? ;) I just added code to the util.py around line 217:

        data['API'] = '<a href="{url}" target="_blank">GeoJSON</a>'.format(
            url=url_for('api_entity', id_=entity.id)) + \
                      ' <a href="{url}" target="_blank">' \
                      ' <img src="/static/images/icons/download.png" alt="download"></a>'.format(
                          url=url_for('api_download_entity', id_=entity.id))

I merged it already in develop!