djangoで整数3桁のカンマ区切り

以下の手順でokだと思ってたんだけどなぜかカンマ区切りにならず
エラーにもならず

1. INSTALLED_APPSに'django.contrib.humanize',を追加

INSTALLED_APPS = ( 
     ....
     'django.contrib.humanize', 
)

2. テンプレートに以下を追加

{% load humanize %}

3. 使う

{{ value|intcomma }}

調べたらNUMBER_GROUPINGの設定が必要だったみたい

NUMBER_GROUPING = 3

django.conf.locale.ja.formatsみるとこの手の設定が色々書いてあるけど、NUMBER_GROUPINGはコメントアウトされてた

# -*- encoding: utf-8 -*-
# This file is distributed under the same license as the Django package.
#
from __future__ import unicode_literals

# The *_FORMAT strings use the Django date format syntax,
# see http://docs.djangoproject.com/en/dev/ref/templates/builtins/#date
DATE_FORMAT = 'Y年n月j日'
TIME_FORMAT = 'G:i:s'
DATETIME_FORMAT = 'Y年n月j日G:i:s'
YEAR_MONTH_FORMAT = 'Y年n月'
MONTH_DAY_FORMAT = 'n月j日'
SHORT_DATE_FORMAT = 'Y/m/d'
SHORT_DATETIME_FORMAT = 'Y/m/d G:i:s'
# FIRST_DAY_OF_WEEK = 

# The *_INPUT_FORMATS strings use the Python strftime format syntax,
# see http://docs.python.org/library/datetime.html#strftime-strptime-behavior
# DATE_INPUT_FORMATS = 
# TIME_INPUT_FORMATS = 
# DATETIME_INPUT_FORMATS = 
DECIMAL_SEPARATOR = '.'
THOUSAND_SEPARATOR = ','
# NUMBER_GROUPING =