Decimal Separator Django

forms.py

from django import forms

class NivelParcelaHabitanteForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(NivelParcelaHabitanteForm, self).__init__(*args, **kwargs)
        self.fields['i'].localize = True
        self.fields['i'].widget.is_localized = True
        self.fields['ii'].localize = True
        self.fields['ii'].widget.is_localized = True
        # o resto dos fields .....