old_contents: from django import template
  from django.utils.safestring import mark_safe
  from django.contrib.humanize.templatetags.humanize import naturalday
  
  register = template.Library()
  
  
  @register.filter
  def country_flag(country):
      return mark_safe(
          '<span class="flag-icon flag-icon-{code}"></span> {name}'.format(
              name=country.name,
              code=country.code.lower()))
  
  
  @register.filter
  def chamber_icon(chamber):
      return mark_safe(
          u'<span class="chamber-icon ' +
          u'chamber-icon-{abbr}"></span> {name}'.format(
              name=chamber.name,
              abbr=chamber.abbreviation.lower()))
  
  
  @register.filter
  def mandate_date(date, arg=None):
      if date is None or date.year == 9999:
          return 'present'
      else:
          return naturalday(date, arg)
  
new_contents: from django import template
  from django.utils.safestring import mark_safe
  from django.contrib.humanize.templatetags.humanize import naturalday
  
  register = template.Library()
  
  
  @register.filter
  def country_flag(country):
      return mark_safe(
          '<span class="flag-icon flag-icon-{code}"></span> {name}'.format(
              name=country.name,
              code=country.code.lower()))
  
  
  @register.filter
  def chamber_icon(chamber):
      return mark_safe(
          u'<span class="chamber-icon ' +
          u'chamber-icon-{abbr}"></span> {name}'.format(
              name=chamber.name,
              abbr=chamber.abbreviation.lower()))
  
  
  @register.filter
  def group_icon(main_mandate):
      return mark_safe(
          u'<span class="group-icon ' +
          u'group-icon-{abbr}"></span> {role} of {name}'.format(
              role=main_mandate.role,
              name=main_mandate.group.name,
              abbr=main_mandate.group.abbreviation.lower()))
  
  
  @register.filter
  def mandate_date(date, arg=None):
      if date is None or date.year == 9999:
          return 'present'
      else:
          return naturalday(date, arg)
  
subject: Add group_icon tag