title: Thousand separator for list_editable in django?
body: <p>*Is there a thousand separator (like 1,000) for list_editable in django?</p>
  
  <pre><code>#model.py
  class Product(models.Model):
  deal_price = models.IntegerField(db_index=True, blank=True, null=True, default=0, validators=[position], verbose_name=_("Current Price"))
  
  -//-
  
  class StockProduct(Product):
      category = models.ForeignKey(to=StockCategory, related_name='stock_products')
      warehouse = models.ForeignKey(to=WareHouse, blank=True, null=True)
  
      objects = ProductManager()
  
  #admin.py
  class StockProductAdmin(admin.ModelAdmin):
      form = StockProductAdminForm
      list_display = ('product_id', 'title', 'quantity', 'category', 'deal_price_sep')
      list_editable = ('quantity', 'deal_price_sep')
  
  def deal_price_sep(self, instance):
          return '{0:,}'.format(self.deal_price)
  
  admin.site.register(models.StockProduct, StockProductAdmin)
  </code></pre>
  
  <p>Whenever I change deal_price_sep to deal_price, it works. But I want the list_editable show price with thousand separator.</p>