old_contents: # -*- coding: utf-8 -*-
  from django.db.models import F, Q
  from django.core.management.base import BaseCommand
  
  from modeltranslation.settings import DEFAULT_LANGUAGE
  from modeltranslation.translator import translator
  from modeltranslation.utils import build_localized_fieldname
  
  
  class Command(BaseCommand):
      help = ('Updates empty values of default translation fields using'
              ' values from original fields (in all translated models).')
  
      def handle(self, *args, **options):
          verbosity = int(options['verbosity'])
          if verbosity > 0:
              self.stdout.write("Using default language: %s" % DEFAULT_LANGUAGE)
          models = translator.get_registered_models(abstract=False)
          for model in models:
              if verbosity > 0:
                  self.stdout.write("Updating data of model '%s'" % model)
              opts = translator.get_options_for_model(model)
              for field_name in opts.fields.keys():
                  def_lang_fieldname = build_localized_fieldname(field_name, DEFAULT_LANGUAGE)
  
                  # We'll only update fields which do not have an existing value
                  q = Q(**{def_lang_fieldname: None})
                  field = model._meta.get_field(field_name)
                  if field.empty_strings_allowed:
                      q |= Q(**{def_lang_fieldname: ""})
  
                  model._default_manager.filter(q).rewrite(False).update(
                      **{def_lang_fieldname: F(field_name)})
  
new_contents: # -*- coding: utf-8 -*-
  from django.db.models import F, Q
  from django.core.management.base import BaseCommand
  
  from modeltranslation.settings import DEFAULT_LANGUAGE
  from modeltranslation.translator import translator
  from modeltranslation.utils import build_localized_fieldname
  
  
  class Command(BaseCommand):
      help = ('Updates empty values of default translation fields using'
              ' values from original fields (in all translated models).')
  
      def handle(self, *args, **options):
          verbosity = options['verbosity']
          if verbosity > 0:
              self.stdout.write("Using default language: %s" % DEFAULT_LANGUAGE)
          models = translator.get_registered_models(abstract=False)
          for model in models:
              if verbosity > 0:
                  self.stdout.write("Updating data of model '%s'" % model)
              opts = translator.get_options_for_model(model)
              for field_name in opts.fields.keys():
                  def_lang_fieldname = build_localized_fieldname(field_name, DEFAULT_LANGUAGE)
  
                  # We'll only update fields which do not have an existing value
                  q = Q(**{def_lang_fieldname: None})
                  field = model._meta.get_field(field_name)
                  if field.empty_strings_allowed:
                      q |= Q(**{def_lang_fieldname: ""})
  
                  model._default_manager.filter(q).rewrite(False).update(
                      **{def_lang_fieldname: F(field_name)})
  
subject: Remove redundant type conversion