Fix duplicate _upgrade_boundfield_class() call
Fix duplicate _upgrade_boundfield_class() call

django-parler/django-parler,skirsdeda/django-parler,django-parler/django-parler,imposeren/django-parler,zhangguiyu/django-parler,edoburu/django-parler,imposeren/django-parler,skirsdeda/django-parler,edoburu/django-parler,zhangguiyu/django-parler