请教各位大神，由于最近在学Django，学到django国际化的时候，出现了小问题：
无论我怎么更改django.po文件，删除重新生成，重启服务器，每次显示的页面仍然是我第一次使用.po文件的样子/(ㄒoㄒ)/~~
settings.py如下：

LANGUAGE_CODE = 'zh-CN'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

LANGUAGES = (
    ('en', ('English')),
    ('zh_CN', ('中文简体')),
    ('zh-hant', ('中文繁體')),
)
LOCALE_PATHS = (
    os.path.join(BASE_DIR, 'locale'),
)

也添加了对应的中间件：

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.middleware.security.SecurityMiddleware',
)

测试的函数，在views.py中如下：

def test1_view(request): 
    n = 2
    weekdays = [_('Monday'), _('Tuesday'), _('Wednesday'), _('Thursday'), _('Friday'), _('Saturday'), 
_('Sunday')] 
    return HttpResponse(weekdays[n])

利用$ python manage.py makemessages -l zh_CN，在/locale/zh_CN/LC_MESSAGES/django.po处生成文件更改如下：

#: testdeploy/views.py:64
msgid "Monday"
msgstr "一"

#: testdeploy/views.py:64
msgid "Tuesday"
msgstr "二"

#: testdeploy/views.py:64
msgid "Wednesday"
msgstr "三"

#: testdeploy/views.py:64
msgid "Thursday"
msgstr "四"

#: testdeploy/views.py:64
msgid "Friday"
msgstr "五"

#: testdeploy/views.py:64
msgid "Saturday"
msgstr "六"

#: testdeploy/views.py:65
msgid "Sunday"
msgstr "七"

并且也删除了#,fuzzy，利用$ django-admin.py compilemessages进行了编译，返回的仍然是第一次试验的时候的：

而且，即使我将.po文件删除，重启服务器同样可以显示，请问这是为什么呢？是否仍然存在类似于cookies之类的缓存需要清除呢？
谢谢各位~