old_contents: from __future__ import unicode_literals
  
  from django.conf import settings
  
  
  # The maximum allowed length for field values.
  FIELD_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_FIELD_MAX_LENGTH", 2000)
  
  # The maximum allowed length for field labels.
  LABEL_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_LABEL_MAX_LENGTH", 200)
  
  # Sequence of custom fields that will be added to the form field types.
  EXTRA_FIELDS = getattr(settings, "FORMS_BUILDER_EXTRA_FIELDS", ())
  
  # Sequence of custom widgets that will add/update form fields widgets.
  EXTRA_WIDGETS = getattr(settings, "FORMS_BUILDER_EXTRA_WIDGETS", ())
  
  # The absolute path where files will be uploaded to.
  UPLOAD_ROOT = getattr(settings, "FORMS_BUILDER_UPLOAD_ROOT", None)
  
  # Boolean controlling whether HTML5 form fields are used.
  USE_HTML5 = getattr(settings, "FORMS_BUILDER_USE_HTML5", True)
  
  # Boolean controlling whether forms are associated to Django's Sites framework.
  USE_SITES = getattr(settings, "FORMS_BUILDER_USE_SITES",
                      "django.contrib.sites" in settings.INSTALLED_APPS)
  
  # Boolean controlling whether form slugs are editable in the admin.
  EDITABLE_SLUGS = getattr(settings, "FORMS_BUILDER_EDITABLE_SLUGS", False)
  
  # Char to start a quoted choice with.
  CHOICES_QUOTE = getattr(settings, "FORMS_BUILDER_CHOICES_QUOTE", "`")
  
  # Char to end a quoted choice with.
  CHOICES_UNQUOTE = getattr(settings, "FORMS_BUILDER_CHOICES_UNQUOTE", "`")
  
  # Char to use as a field delimiter when exporting form responses as CSV.
  CSV_DELIMITER = getattr(settings, "FORMS_BUILDER_CSV_DELIMITER", ",")
  
  # The maximum allowed length for field help text
  HELPTEXT_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_HELPTEXT_MAX_LENGTH", 100)
  
  # The maximum allowed length for field choices
  CHOICES_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_CHOICES_MAX_LENGTH", 1000)
  
  # Does sending emails fail silently or raise an exception.
  EMAIL_FAIL_SILENTLY = getattr(settings, "FORMS_BUILDER_EMAIL_FAIL_SILENTLY",
                                settings.DEBUG)
  
  # Django SITE_ID - need a default since no longer provided in settings.py.
  SITE_ID = getattr(settings, "SITE_ID", 1)
  
new_contents: from __future__ import unicode_literals
  
  from django.conf import settings
  from django.core.exceptions import ImproperlyConfigured
  
  
  if not (getattr(settings, "SITE_ID") and
          "django.contrib.sites" in settings.INSTALLED_APPS):
      raise ImproperlyConfigured("django.contrib.sites is required")
  
  
  # The maximum allowed length for field values.
  FIELD_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_FIELD_MAX_LENGTH", 2000)
  
  # The maximum allowed length for field labels.
  LABEL_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_LABEL_MAX_LENGTH", 200)
  
  # Sequence of custom fields that will be added to the form field types.
  EXTRA_FIELDS = getattr(settings, "FORMS_BUILDER_EXTRA_FIELDS", ())
  
  # Sequence of custom widgets that will add/update form fields widgets.
  EXTRA_WIDGETS = getattr(settings, "FORMS_BUILDER_EXTRA_WIDGETS", ())
  
  # The absolute path where files will be uploaded to.
  UPLOAD_ROOT = getattr(settings, "FORMS_BUILDER_UPLOAD_ROOT", None)
  
  # Boolean controlling whether HTML5 form fields are used.
  USE_HTML5 = getattr(settings, "FORMS_BUILDER_USE_HTML5", True)
  
  # Boolean controlling whether forms are associated to Django's Sites framework.
  USE_SITES = getattr(settings, "FORMS_BUILDER_USE_SITES", False)
  
  # Boolean controlling whether form slugs are editable in the admin.
  EDITABLE_SLUGS = getattr(settings, "FORMS_BUILDER_EDITABLE_SLUGS", False)
  
  # Char to start a quoted choice with.
  CHOICES_QUOTE = getattr(settings, "FORMS_BUILDER_CHOICES_QUOTE", "`")
  
  # Char to end a quoted choice with.
  CHOICES_UNQUOTE = getattr(settings, "FORMS_BUILDER_CHOICES_UNQUOTE", "`")
  
  # Char to use as a field delimiter when exporting form responses as CSV.
  CSV_DELIMITER = getattr(settings, "FORMS_BUILDER_CSV_DELIMITER", ",")
  
  # The maximum allowed length for field help text
  HELPTEXT_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_HELPTEXT_MAX_LENGTH", 100)
  
  # The maximum allowed length for field choices
  CHOICES_MAX_LENGTH = getattr(settings, "FORMS_BUILDER_CHOICES_MAX_LENGTH", 1000)
  
  # Does sending emails fail silently or raise an exception.
  EMAIL_FAIL_SILENTLY = getattr(settings, "FORMS_BUILDER_EMAIL_FAIL_SILENTLY",
                                settings.DEBUG)
  
  # Django SITE_ID - need a default since no longer provided in settings.py.
  SITE_ID = getattr(settings, "SITE_ID", 1)
  
subject: Raise a clearer error if the sites app is missing. Closes #154.