##models.py
#...
from django.db import models
from wagtail.core.fields import RichTextField

@register_snippet
class Comment(models.Model):
    name = models.CharField(max_length=255, verbose_name="Имя", null=True, )
    comment = RichTextField(verbose_name = "Отзыв", null=True)

##views.py
from django.views.generic.edit import CreateView
...
class AjaxableResponseMixin:
    """
    Mixin to add AJAX support to a form.
    Must be used with an object-based FormView (e.g. CreateView)
    """
    success_url = '/'
    def form_invalid(self, form):
        response = super().form_invalid(form)
        if self.request.is_ajax():

            return JsonResponse(form.errors, status=400)
        else:
            return response

    def form_valid(self, form):

        response = super().form_valid(form)
        if self.request.is_ajax():
            data = {
                'status': 'Success!',
            }
            return JsonResponse(data)
        else:

            return self.render_to_response(self.get_context_data(form=form))

class CommentCreate(AjaxableResponseMixin, CreateView):
    model = Comment
    fields = ['name', 'comment']

#urls.py
...
urlpatterns = [
...
    url(r'^some/url/$', CommentCreate.as_view()),
...
]