How to translate validations from AUTH_PASSWORD_VALIDATORS in UserCreationForm - django

Question

I have a multiple language app (Django 1.11) with a form to create new users. In this form, the error messages when the user send invalid input must come in Portuguese (pt-BR) or English (en-US) based on the selected language. The custom validations and some of the automatic Django messages for validations are well translated, but not the following: "The password is too similar to the username."; "This password is too short. It must contain at least 8 characters." and "This password is too common.". Actually, they are shown in Portuguese, since the LANGUAGE_CODE from settings.py is 'pt-BR'.
I was able to translate some of the automatic messages such "A user with that username already exists." with django.utils.translation.activate as in the following code.
from django.utils.translation import activate
activate(curr_lang)
But this wasn't enough to translate the validations from settings.AUTH_PASSWORD_VALIDATORS. I manually changed the LANGUAGE_CODE from 'pt-BR' to 'en-US' and was able to see the messages only in English. What is the best strategy to translate these messages? As far as I researched, setting LANGUAGE_CODE is not a option, since the results I find suggest the use of django.utils.translation.activate. Thanks in advance

Answer 1

After several tries, I think the solution was:
Add "django.middleware.locale.LocaleMiddleware" to MIDDLEWARE at settings.py (be careful with the order as explained at the documentation)
MIDDLEWARE = (
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
...
Add the LANGUAGES const also at settings.py after LANGUAGE_CODE, which has to contain the default language
LANGUAGE_CODE = 'pt-BR'
LANGUAGES = [
('pt-BR', 'Portuguese'),
('en-US', 'English'),
]
Use Django's default set_language method - on urls.py, add the following line:
urlpatterns = [
....
url(r'^i18n/', include('django.conf.urls.i18n')),
And, on the html file with the selection of language,
{% load i18n %}
{% load staticfiles %}
<form action="{% url 'set_language' %}" method="post">{% csrf_token %}
<input name="next" type="hidden" value="{{ redirect_to }}" />
<select name="language" id="curr_lang" class="select2-single" onchange="this.form.submit()">
{% get_current_language as LANGUAGE_CODE %}
{% get_available_languages as LANGUAGES %}
{% get_language_info_list for LANGUAGES as languages %}
<option value="pt-BR" title="Português" {% if LANGUAGE_CODE == 'pt-br' %}selected{% endif %}>{% static 'img/flags/br.png' %}</option>
<option value="en-US" title="English" {% if LANGUAGE_CODE == 'en-us' %}selected{% endif %}>{% static 'img/flags/us.png' %}</option>
</select>
</form>
On context_processor.py, define a function (I'm calling global_env) to be run at the end of every view. On settings.py, add 'your-application-name-here.context_processor.global_env' such as
TEMPLATES = [
...
'OPTIONS': {
'context_processors': [
'your-application-name-here.context_processor.global_env',
...
And, on context_processor.py, the function must have
def global_env(request):
from django.utils.translation import activate
curr_lang = request.session[LANGUAGE_SESSION_KEY]
activate(curr_lang)
# More code to render dictionary to views for non-default messages on page
....
I think these steps complete the translation of default form validation messages from Django without the need of custom validators.