Custom error_messages

This day I have read the mass of information about overiding form default error_messages and I just can not handle it. I do not know what is wrong with my code and why my custom message does not work:

###forms.py###

# -*- coding: utf-8 -*-

from django import forms
from django.forms import ModelForm
from django.utils.translation import ugettext as _


from comments.models import Comment

class CommentForm(ModelForm):

    class Meta:
        model = Comment
        fields = ['text',]

        labels = {
            'text': '',
        }

        error_messages = {
            'text': {
                'required': _("lknlkjnlkjnl"),
               },
        }

        widgets = {
            'text': forms.Textarea(
                attrs = {
                    'id': 'text-comment-input',
                    'placeholder': 'Wpisz tu treść zgłoszenia...',
                }
            ),
        }

###views.py###
from django.shortcuts import render
from django.shortcuts import render_to_response
from django.core.urlresolvers import reverse
from django.views import generic
from django.template import RequestContext
from django.http import JsonResponse

from comments.models import Comment
from companies.models import Company

# Create your views here.

class IndexView(generic.ListView):
    model = Comment

    def get_queryset(self):
        return  Comment.objects.filter(company = self.kwargs['pk']).order_by('-add_date')

class AjaxableResponseMixin(object):
    def form_invalid(self, form):
        response = super(AjaxableResponseMixin, self).form_invalid(form)
        if self.request.is_ajax():
            return JsonResponse(form.errors, status = 400)
        else:
            return response

    def form_valid(self, form):
        form.instance.company = Company.objects.get(pk = self.kwargs['company'])
        response = super(AjaxableResponseMixin, self).form_valid(form)
        if self.request.is_ajax():
            five_comments_list = Comment.objects.order_by('-add_date').filter(company = self.object.company)
            data = {}
            data['five_comments_list'] = five_comments_list

            return render_to_response('companies/includes/_five_comments_list.html', data, context_instance=RequestContext(self.request))
        else:
            return response

class AddView(AjaxableResponseMixin, generic.edit.CreateView):
    model = Comment
    fields = ['text']

    def get_success_url(self):
        return reverse('companies:detail', args = (self.kwargs['company'],))

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