How to display translations in every password validation help text in Django?

Despite the fact that password validation help texts are translated in the official Greek translation (here), they don't seem to appear in my 3.0.3 application. Here's a screenshot of the custom registration form.

As you can see the only working translation appears to be the one corresponding to MinimumLengthValidator while the others appear in English, despite the browser's Greek language setting. I would like to know a way to introduce translations for the entirety of help_text bullets under the password field in the registration form.

Some crucial parts of my code

settings.py

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.locale.LocaleMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
        'OPTIONS': {
            'min_length': 8,
        }
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]

LANGUAGE_CODE = 'el'

LANGUAGES = [
    ('el', _('Greek')),
    ('en', _('English')),
]

LOCALE_PATHS = (
    os.path.join(BASE_DIR, 'locale'),
)

TIME_ZONE = 'Europe/Athens'

USE_I18N = True

USE_L10N = False

USE_TZ = True

forms.py

from django import forms
from django.contrib.auth import authenticate, login, get_user_model
from django.contrib.auth.forms import AuthenticationForm, UserCreationForm, ReadOnlyPasswordHashField
from django.urls import reverse
from django.utils.html import mark_safe
from django.utils.translation import ugettext as _

User = get_user_model()

from .models import User, Profile, EmailActivation

class RegisterForm(UserCreationForm):
    email = forms.EmailField(
        label='E-mail',
        help_text=_('Please add a valid e-mail address.'),
    )
    accept_tou = forms.BooleanField(
        required=False,
        label=_('I have read and accept the Terms of Use.'),
    )

    def __init__(self, *args, **kwargs):
        super(RegisterForm, self).__init__(*args, **kwargs)
        for field_name, field in self.fields.items():
            if field_name != 'accept_tou':
                if field.widget.attrs.get('class'):
                    field.widget.attrs['class'] += ' form-control'
                else:
                    field.widget.attrs['class'] = 'form-control'

    def clean_accept_tou(self):
        accepted_tou = self.cleaned_data.get('accept_tou')
        if not accepted_tou:
            raise forms.ValidationError("You cannot register unless \
                you accept our Terms of Use")

    class Meta:
        model = User
        fields = ('email', 'password1', 'password2')

views.py

from django.views.generic.edit import CreateView
from .forms import RegisterForm

class RegisterView(CreateView):
    form_class = RegisterForm
    template_name = 'accounts/register.html'
    success_url = reverse_lazy("accounts:email-register")

    def get_context_data(self, *args, **kwargs):
        context = super(RegisterView, self).get_context_data(*args, **kwargs)
        context["title"] = _("Register")
        context["header"] = _("Register")
        return context

register.html

{% extends "base.html" %}

{% load i18n %}

{% block title %}{{ title }}{% endblock %}

{% block content %}
<div class='row'>
    <div class="col-12">
        {% if header %}
        <h3 class="mb-3">{{ header }}</h3>
        <hr/>
        {% endif %}
    </div>
    <div class="col-md-6">
        <form method='post' action=''>
        {% csrf_token %}
        {% for field in form %}
        <p>
        {% if field.name == 'accept_tou' %}
            {{ field }}
            {% trans 'I have read and accept the' %} <a href="{% url 'terms-user' %}" target="_blank">{% trans 'Terms of Use for registered users' %}</a>.
        {% else %}
            {{ field.label_tag }}
            {{ field }}
        {% endif %}

        {% if field.help_text %}
        <small class="form-text text-muted">{{ field.help_text }}</small>
        {% endif %}

        {% if field.errors %}
        <div class="alert alert-danger" role="alert">
            {% for error in field.errors %}
                {{ error }}</br>
            {% endfor %}
        </div>
        {% endif %}

        </p>
        {% endfor %}
        <button type="submit" class='btn btn-block btn-primary'>{% trans 'Register' %}</button>
        </form>
    </div>
</div>
{% endblock %}