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How to make the ContentType foreignkey i18n?
from django.utils.translation import ugettext_lazy as _

class Event(models.Model):
    ...

    class Meta:
        verbose_name = _(u'Event')
        verbose_name_plural = _(u'Events')

def content_type_choices(**kwargs):
    content_types = []
    for content_type in ContentType.objects.filter(**kwargs):
        content_types.append((content_type.pk, content_type.model_class()._meta.verbose_name))

    return content_types

LIMIT_CHOICES_TO = {'model__startswith': 'pageapp_'}

class PageWAForm(forms.ModelForm):
    app_page_type = forms.ModelChoiceField(queryset=ContentType.objects.filter(**LIMIT_CHOICES_TO),
                                           empty_label=None)

    def __init__(self, *args, **kwargs):
        super(PageWAForm, self).__init__(*args, **kwargs)
        self.fields['app_page_type'].choices = content_type_choices(**LIMIT_CHOICES_TO)