old_contents: from django.utils.translation import ugettext, ugettext_lazy as _
  
  class City(object):
      SM = 'sm'
      GR = 'gr'
  
      CHOICES = (
          (SM, _("Saint-Martin-d'Hères")),
          (GR, _('Grenoble')),
      )
  
  
  class FlatType(object):
      F = 'f'
      H = 'h'
  
      CHOICES = (
          (F, _('flat')),
          (H, _('house')),
      )
  
  
  class GES(object):
      A = 'A'
      B = 'B'
      C = 'C'
      D = 'D'
      E = 'E'
      F = 'F'
      G = 'G'
      H = 'H'
      I = 'I'
  
      CHOICES = (
          (A, _('<5')),
          (B, _('6 to 10')),
          (C, _('11 to 20')),
          (D, _('21 to 35')),
          (E, _('36 to 55')),
          (F, _('56 to 80')),
          (G, _('81 to 110')),
          (H, _('110 to 145')),
          (I, _('>145')),
      )
  
  
  class Energy(object):
      A = 'A'
      B = 'B'
      C = 'C'
      D = 'D'
      E = 'E'
      F = 'F'
      G = 'G'
      H = 'H'
      I = 'I'
  
      CHOICES = (
          (A, _('<50')),
          (B, _('51 to 90')),
          (C, _('91 to 150')),
          (D, _('151 to 230')),
          (E, _('231 to 330')),
          (F, _('331 to 450')),
          (G, _('451 to 590')),
          (H, _('591 to 750')),
          (I, _('>750')),
      )
  
  
new_contents: from django.utils.translation import ugettext, ugettext_lazy as _
  
  class City(object):
      CHOICES = (
          ('sm', _("Saint-Martin-d'Hères")),
          ('gr', _('Grenoble')),
      )
  
  
  class FlatType(object):
      CHOICES = (
          ('f', _('flat')),
          ('h', _('house')),
      )
  
  
  class GES(object):
      CHOICES = (
          ('A', _('<5')),
          ('B', _('6 to 10')),
          ('C', _('11 to 20')),
          ('D', _('21 to 35')),
          ('E', _('36 to 55')),
          ('F', _('56 to 80')),
          ('G', _('81 to 110')),
          ('H', _('110 to 145')),
          ('I', _('>145')),
      )
  
  
  class Energy(object):
      CHOICES = (
          ('A', _('<50')),
          ('B', _('51 to 90')),
          ('C', _('91 to 150')),
          ('D', _('151 to 230')),
          ('E', _('231 to 330')),
          ('F', _('331 to 450')),
          ('G', _('451 to 590')),
          ('H', _('591 to 750')),
          ('I', _('>750')),
      )
  
  
subject: refactor references