Sign Instance
GET /data/api/signs/129/?format=api
https://labasi.acdh.oeaw.ac.at/data/api/signs/129/?format=api", "sign_name": "ŠEŠ", "abz_number": "331", "meszl_number": "535", "image_1": "https://labasi.acdh.oeaw.ac.at/media/sign_img/sign_331.jpg", "image_2": null }{ "url": "