Problem with validating ModelForm

I use ModelForm to create my form. All works fine except 1 thing - validating the unique field.

Code:

class Article(models.Model):

...

title = models.CharField(max_length=255, unique=True, error_messages={'max_length' : 'max translation',

                                                                                                    'unique' : 'unique translation',

                                                                                                    'required' : 'req translation',})

...

class ArticleForm(ModelForm):

...

title = forms.CharField(max_length=255, min_length=3, error_messages={'required' : 'req translation',

                                                                                             'min_length' : 'min translation',

                                                                                             'max_length' : 'max translation',

                                                                                             'unique' : 'unique translation',}) 

But when I save my form with  non-unique title I don't get my custom translated error but I get default error. How to fix it, that my unique field error is displayed?

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