How to change language of months in “SelectDateWidget” django

I am using widget SelectDateWidget, and i am trying to change the name of months form english to portuguese, i already tried this:

https://docs.djangoproject.com/en/2.1/topics/i18n/

is not working

forms.py

class RegisterForm2(forms.Form):
gender = forms.ChoiceField(label="Género", choices = UserRegister.gender_choices, required=True)
birthdate = forms.DateField(widget = forms.SelectDateWidget, localize=True)
class meta:
    model = UserRegister
    fields = ['gender',
              'birthdate']

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