问Django-cms占位符翻译，与语言相关的呈现

EN

# models.py

from cms.models import PlaceholderField, Placeholder
from django.conf import settings
from django.contrib.auth.models import User
from django.db import models
from django.db.models import Q
from django.utils.translation import ugettext_lazy as _
from hvad.manager import TranslationAwareManager

class LanguageManager(TranslationAwareManager):
    def for_language(self, language):
        return self.get_queryset().filter(Q(language__isnull=True) | Q(language=language))


class CustomPage(models.Model):

    language = models.CharField(_('language'), max_length=5, null=True, blank=True, choices=settings.LANGUAGES,
                                help_text=_('leave empty to display in all languages'))

    placeholder_abstract = PlaceholderField('abstract', related_name='%(class)s_abstracts')
    placeholder_content = PlaceholderField('content', related_name='%(class)s_contents')
    placeholder_links = PlaceholderField('links', related_name='%(class)s_links')

    created_by = models.ForeignKey(User, null=False, blank=False, related_name='+', editable=False)
    modified_by = models.ForeignKey(User, null=False, blank=False, related_name='+', editable=False)
    created = models.DateTimeField(auto_now_add=True, editable=False)
    last_modified = models.DateTimeField(auto_now=True, editable=False)

    objects = LanguageManager()