django 1.3国际化……切换语言需要服务器重启？

<form action="/i18n/setlang/" method="post" class="forms">
{% csrf_token %}
<input name="next" type="hidden" value="/next/page/" />
<select name="language" id="select_langauge" class="m_show hide">
{% for lang in LANGUAGES %}
    {% if lang.0 != '' %}
        <option value="{{lang.0}}">{{lang.1}}</option>
    {% endif %}
{% endfor %}
</select>

这与django 1.2一起工作正常.但是,自从升级到Django 1.3后,这不起作用.我可以看到LANGUAGE_CODE发生了变化,但实际的语言输出并不是我所期望的.

但是,当我重新启动django服务器时,它显示正确的语言.我错过了什么？

我在settings.py中有这个

LANGUAGE_CODE = 'en-us'
SITE_ID = 1

USE_I18N = True

gettext = lambda s: s

LANGUAGES = (
    ('',gettext('Please select')),('en',gettext('English')),('ko',gettext('Korean')),)

USE_L10N = True


MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware','django.contrib.sessions.middleware.SessionMiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.AuthenticationMiddleware','django.middleware.locale.LocaleMiddleware',)