old_contents: from django import template
  from django.forms import ModelForm, BaseFormSet
  from django.db.models import Model
  
  from django_select2.fields import AutoModelSelect2Field, AutoModelSelect2MultipleField
  
  
  register = template.Library()
  
  
  @register.filter
  def get_model_verbose_name(instance):
      if isinstance(instance, Model):
          return instance._meta.verbose_name.title()
      return '<unknown>'
  
  
  @register.filter
  def get_form_model_verbose_name(instance):
      if isinstance(instance, ModelForm):
          return instance._meta.model._meta.verbose_name.title()
      if isinstance(instance, BaseFormSet):
          return instance.model._meta.verbose_name_plural.title()
      return '<unknown>'
  
  
  @register.filter
  def is_select2_field(form, field):
      select2_classes = (AutoModelSelect2Field, AutoModelSelect2MultipleField)
      res = any(isinstance(field.field, cls) for cls in select2_classes)
      return res
  
new_contents: from django import template
  from django.db.models import Model
  from django.forms import BaseFormSet, ModelForm
  
  register = template.Library()
  
  
  @register.filter
  def get_model_verbose_name(instance):
      if isinstance(instance, Model):
          return instance._meta.verbose_name.title()
      return '<unknown>'
  
  
  @register.filter
  def get_form_model_verbose_name(instance):
      if isinstance(instance, ModelForm):
          return instance._meta.model._meta.verbose_name.title()
      if isinstance(instance, BaseFormSet):
          return instance.model._meta.verbose_name_plural.title()
      return '<unknown>'
  
subject: Remove useless templatetags