How to display two languages ​​in a form in Django-modeltranslation?

Question

Django

There is a model:

class Cargo(models.Model):
    """Base model of cargo"""
    company = models.ForeignKey(Profile, on_delete=models.CASCADE, verbose_name=_('Company'))
    title = models.CharField(max_length=500, verbose_name=_('Title'))
    slug = models.SlugField(unique=True, verbose_name=_('URL address'))
    description = tinymce_models.HTMLField(verbose_name=_('Description'))

translation.py

@register(Cargo )
class CargoTranslationOptions(TranslationOptions):
    fields = ('title', 'description',)

forms.py

class CargoAddForm(TranslationModelForm):
    class Meta:
        model = Cargo
        fields = '__all__'

views.py

class CargoAdd(CreateView):
    """Add Cargo in profile"""
    model = Cargo
    form_class = CargoAddForm

I display this form in the template and the usual form without fields in English and Russian is displayed. I understand that when you change the language on the site, you can fill in the fields in this language in the form, but the problem is that the page reloads when you change the language and all the entered data in Russian is lost. How to implement the addition of this model with the output of fields in two languages?