old_contents: from django import forms
  from django.forms.models import BaseModelFormSet
  from django.utils.translation import ugettext_lazy as _
  
  
  class BaseWordFormSet(BaseModelFormSet):
      def add_fields(self, form, index):
          super(BaseWordFormSet, self).add_fields(form, index)
          form.fields["isLocal"] = forms.BooleanField(label=_("Local"))
  
  
new_contents: from django import forms
  from django.forms.models import BaseModelFormSet
  from django.utils.translation import ugettext_lazy as _
  
  
  class BaseWordFormSet(BaseModelFormSet):
      def add_fields(self, form, index):
          super(BaseWordFormSet, self).add_fields(form, index)
          form.fields["isLocal"] = forms.BooleanField(label=_("Local"), required=False)
  
  
subject: Make sure the isLocal BooleanField is not required