Sign Instance
GET /data/api/signs/246/?format=api
http://labasi.acdh.oeaw.ac.at/data/api/signs/246/?format=api", "sign_name": "ŠUN", "abz_number": "008", "meszl_number": "17", "image_1": "http://labasi.acdh.oeaw.ac.at/media/sign_img/shun_008.jpg", "image_2": null }{ "url": "