old_contents: from django.contrib import admin
  
  from .models import Annotation, NLRequest, Translation, User
  
  admin.site.register(User)
  admin.site.register(NLRequest)
  admin.site.register(Translation)
  admin.site.register(Annotation)
new_contents: from django.contrib import admin
  
  from .models import Annotation, NLRequest, Translation, URL, URLTag, User
  
  admin.site.register(URL)
  admin.site.register(User)
  admin.site.register(NLRequest)
  admin.site.register(Translation)
  admin.site.register(Annotation)
  admin.site.register(URLTag)
subject: add more objects to administration panel