Django only translating one word

Question

I am attempting a navbar translation to simplified Chinese in Django, however, only the first word is being translated. To wit, I have created a navbar.html with the following content:

{% load i18n %}
<li><a href="{% url 'homepage' %}">{% trans 'Home' %}</a></li>
<li><a href="{% url 'security' %}">{% trans 'Security' %}</a></li>

I then do a ./manage.py makemessages -l zh_CN and constructed a file django.po which contains

#: templates/navbar.html:20
msgid "Home"
msgstr "首页"

#: templates/navbar.html:25
msgid "Security"
msgstr "安全性"

I then did a ./manage.py compilemessages to get the django.mo, which appears to have all the translations I need.

As opposed to this question, my LOCALE_PATHS is indeed a tuple:

LOCALE_PATHS = (
    os.path.join(BASE_DIR, 'locale'),
)

and my LocaleMiddleware is after SessionMiddleware and before CommonMiddleware, as the documentation specifies:

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    ...
]

Yet nonetheless, only Home is translated; all other template variables are left untranslated.

To add a bit more mystery, I translated the navbar to Spanish and all variable were translated properly in the browser. This made me suspect my browser was not using the correct language code, so I ran ./manage.py makemessages -l zh-hans and copied over the translation from the zh_CN directory, but no dice.

Following this, I have removed all instances of #, fuzzy, to no avail.

I am on Django 1.10.3 and Python 3.5.