old_contents: import json
  
  from django.template import Library
  from django.utils.encoding import force_text
  from django.utils.text import capfirst
  from django.utils.translation import ugettext
  
  from polymorphic.formsets import BasePolymorphicModelFormSet
  
  
  register = Library()
  
  
  @register.filter()
  def include_empty_form(formset):
      """
      Make sure the "empty form" is included when displaying a formset (typically table with input rows)
      """
      for form in formset:
          yield form
  
      if hasattr(formset, 'empty_forms'):
          # BasePolymorphicModelFormSet
          for form in formset.empty_forms:
              yield form
      else:
          # Standard Django formset
          yield formset.empty_form
  
  
  @register.filter
  def as_script_options(formset):
      """
      A JavaScript data structure for the JavaScript code
  
      This generates the ``data-options`` attribute for ``jquery.django-inlines.js``
      The formset may define the following extra attributes:
  
      - ``verbose_name``
      - ``add_text``
      - ``show_add_button``
      """
      verbose_name = getattr(formset, 'verbose_name', formset.model._meta.verbose_name)
      options = {
          'prefix': formset.prefix,
          'pkFieldName': formset.model._meta.pk.name,
          'addText': getattr(formset, 'add_text', None) or ugettext('Add another %(verbose_name)s') % {
              'verbose_name': capfirst(verbose_name),
          },
          'showAddButton': getattr(formset, 'show_add_button', True),
          'deleteText': ugettext('Verwijder'),
      }
  
      if isinstance(formset, BasePolymorphicModelFormSet):
          # Allow to add different types
          options['childTypes'] = [
              {
                  'name': force_text(model._meta.verbose_name),
                  'type': model._meta.model_name,
              } for model in formset.child_forms.keys()
          ]
  
      return json.dumps(options)
  
  
  @register.filter
  def as_form_type(form):
      """
      Usage: ``{{ form|as_form_type }}``
      """
      return form._meta.model._meta.model_name
  
  
  @register.filter
  def as_model_name(model):
      """
      Usage: ``{{ model|as_model_name }}``
      """
      return model._meta.model_name
  
new_contents: import json
  
  from django.template import Library
  from django.utils.encoding import force_text
  from django.utils.text import capfirst
  from django.utils.translation import ugettext
  
  from polymorphic.formsets import BasePolymorphicModelFormSet
  
  
  register = Library()
  
  
  @register.filter()
  def include_empty_form(formset):
      """
      Make sure the "empty form" is included when displaying a formset (typically table with input rows)
      """
      for form in formset:
          yield form
  
      if hasattr(formset, 'empty_forms'):
          # BasePolymorphicModelFormSet
          for form in formset.empty_forms:
              yield form
      else:
          # Standard Django formset
          yield formset.empty_form
  
  
  @register.filter
  def as_script_options(formset):
      """
      A JavaScript data structure for the JavaScript code
  
      This generates the ``data-options`` attribute for ``jquery.django-inlines.js``
      The formset may define the following extra attributes:
  
      - ``verbose_name``
      - ``add_text``
      - ``show_add_button``
      """
      verbose_name = getattr(formset, 'verbose_name', formset.model._meta.verbose_name)
      options = {
          'prefix': formset.prefix,
          'pkFieldName': formset.model._meta.pk.name,
          'addText': getattr(formset, 'add_text', None) or ugettext('Add another %(verbose_name)s') % {
              'verbose_name': capfirst(verbose_name),
          },
          'showAddButton': getattr(formset, 'show_add_button', True),
          'deleteText': ugettext('Delete'),
      }
  
      if isinstance(formset, BasePolymorphicModelFormSet):
          # Allow to add different types
          options['childTypes'] = [
              {
                  'name': force_text(model._meta.verbose_name),
                  'type': model._meta.model_name,
              } for model in formset.child_forms.keys()
          ]
  
      return json.dumps(options)
  
  
  @register.filter
  def as_form_type(form):
      """
      Usage: ``{{ form|as_form_type }}``
      """
      return form._meta.model._meta.model_name
  
  
  @register.filter
  def as_model_name(model):
      """
      Usage: ``{{ model|as_model_name }}``
      """
      return model._meta.model_name
  
subject: Fix deleteText of |as_script_options