[Python] Django urls aren't being translated

Following Translating URL patterns, I can make my urls being prefixed with the active language, but I can't get them translated.

urls.py

from django.conf.urls import include, url
from django.conf.urls.i18n import i18n_patterns
from django.utils.translation import ugettext_lazy as _

from django.contrib import admin
from django.conf.urls.static import static
from django.conf import settings

from exercises.views import ExerciseListView

urlpatterns = [
url(r'^admin/', include(admin.site.urls)),
]

urlpatterns += i18n_patterns(
...
url(_(r'^exercises/$'), ExerciseListView.as_view(), name='list'),
) + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)


locale/es/LC_MESSAGES/django.po

#: myproject/urls.py:54
msgid "^exercises/$"
msgstr "^ejercicios/$"


manage.py shell

>>> from django.core.urlresolvers import reverse
>>> from django.utils.translation import activate
>>> activate('en')
>>> reverse('list')
'/en/exercises/'
>>> activate('es')
>>> reverse('list')
'/es/exercises/' <---- should be /es/ejercicios as translated in .po


How can I make reverse('list') display '/es/ejercicios/' ?

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