old_contents: from django.db import models
  from django.contrib.auth.models import AbstractUser, Group
  from django.utils.translation import ugettext_lazy as _
  from timezone_field import TimeZoneField
  
  
  class User(AbstractUser):
      """
          Project's base user model
      """
      organization = models.CharField(null=True, blank=True, max_length=80, verbose_name=_('Organization'))
      public_key = models.TextField(blank=True, null=True, verbose_name=_('Public key'))
      fingerprint = models.CharField(null=True, blank=True, max_length=50, verbose_name=_('Fingerprint'))
      keyserver_url = models.URLField(null=True, blank=True, verbose_name=_('Key server URL'))
      server_signed = models.BooleanField(default=False, verbose_name=_('Server signed'))
  
      timezone = TimeZoneField(default='UTC', verbose_name=_('Timezone'))
  
      def has_setup_complete(self):
          if self.public_key and self.fingerprint:
              return True
          return False
  
      @property
      def has_public_key(self):
          return True if self.public_key else False
  
      @property
      def has_keyserver_url(self):
          return True if self.keyserver_url else False
  
  
  class Notification(models.Model):
      """
          These notifications are emails sent to all users (or some subset)
          by an Administrator. Just once.
      """
  
      subject = models.CharField(null=False, blank=False, max_length=150, verbose_name=_('Subject'))
      body = models.TextField(null=False, blank=False, verbose_name=_('Body'))
  
      created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('Created at'))
      updated_at = models.DateTimeField(auto_now=True, verbose_name=_('Updated at'))
  
      sent_at = models.DateTimeField(null=True, verbose_name=_('Sent at'))
      send_to = models.ForeignKey(Group, null=True, blank=True, verbose_name=_('Send to'))
  
      class Meta:
          verbose_name = _('Notification')
          verbose_name_plural = _('Notifications')
  
      def __str__(self):
          return self.subject
  
      def delete(self):
          return super().delete() if not self.sent_at else False
  
new_contents: from django.db import models
  from django.contrib.auth.models import AbstractUser, Group
  from django.utils.translation import ugettext_lazy as _
  from timezone_field import TimeZoneField
  #from languages.fields import LanguageField
  
  
  class User(AbstractUser):
      """
          Project's base user model
      """
      LANGUAGE_CHOICES = (
          ('en-us', 'English'),
          ('pt-pt', _('Portuguese')),
      )
  
      organization = models.CharField(null=True, blank=True, max_length=80, verbose_name=_('Organization'))
      public_key = models.TextField(blank=True, null=True, verbose_name=_('Public key'))
      fingerprint = models.CharField(null=True, blank=True, max_length=50, verbose_name=_('Fingerprint'))
      keyserver_url = models.URLField(null=True, blank=True, verbose_name=_('Key server URL'))
      server_signed = models.BooleanField(default=False, verbose_name=_('Server signed'))
      language = models.CharField(default="en-us", max_length=5, verbose_name=_('Prefered language'))
      timezone = TimeZoneField(default='UTC', verbose_name=_('Timezone'))
      language = models.CharField(default="en-us", max_length=10, choices=LANGUAGE_CHOICES , verbose_name=_('Language'))
  
  
  
      def has_setup_complete(self):
          if self.public_key and self.fingerprint:
              return True
          return False
  
      @property
      def has_public_key(self):
          return True if self.public_key else False
  
      @property
      def has_keyserver_url(self):
          return True if self.keyserver_url else False
  
  
  class Notification(models.Model):
      """
          These notifications are emails sent to all users (or some subset)
          by an Administrator. Just once.
      """
  
      subject = models.CharField(null=False, blank=False, max_length=150, verbose_name=_('Subject'))
      body = models.TextField(null=False, blank=False, verbose_name=_('Body'))
  
      created_at = models.DateTimeField(auto_now_add=True, verbose_name=_('Created at'))
      updated_at = models.DateTimeField(auto_now=True, verbose_name=_('Updated at'))
  
      sent_at = models.DateTimeField(null=True, verbose_name=_('Sent at'))
      send_to = models.ForeignKey(Group, null=True, blank=True, verbose_name=_('Send to'))
  
      class Meta:
          verbose_name = _('Notification')
          verbose_name_plural = _('Notifications')
  
      def __str__(self):
          return self.subject
  
      def delete(self):
          return super().delete() if not self.sent_at else False
  
subject: add language field for user model