Gettext Translation are not translated by django in the admin in a Form Override

[andreac81@…]

This is the problem that i have found.
I have created a simple model like this:

from django.db import models
from django.utils.translation import ugettext_lazy as _

# Create your models here.

class Test(models.Model):
    simple_test = models.TextField(_("simple text"))

Then, for some reasons, i want to customize the behaviour of the admin interface, so i want to define
a special form for my model. So there is the code:

from testapp.models import Test
from django.contrib import admin
from django.utils.translation import ugettext_lazy as _
from django import forms

class MyTestForm(forms.ModelForm):
    simple_test = forms.CharField(_('simple text'))

    class Meta:
        model = Test

class MyTestAdmin(admin.ModelAdmin):
    form = MyTestForm

admin.site.register(Test, MyTestAdmin)

So, after giving the usual commands django-admin makemessages -l it and django-admin compilemessages, and after writing
the translation in the django.po file, i can't get the translation.
Instead if i change the line:

admin.site.register(Test, MyTestAdmin)

to

admin.site.register(Test)

everything works fine.

[andreac81@…]

Test case (create the db with manage.py syncdb)

[Ramiro Morales]

(reformatted description)