def clean_other_lang(self):

    """Cleaner for validating Other language field.

    """

    cleaned_data = self.cleaned_data

    lang = cleaned_data.get('language')

    other_lang = cleaned_data.get('other_lang')

    if lang == 'Other' and not other_lang:

      raise forms.ValidationError('Please fill in the other language field.')

    return other_lang

  def clean(self):

    """Form cleaner for accepting the terms and conditions.

    """

    cleaned_data = self.cleaned_data

    accept = cleaned_data.get('accept')

    if not accept:

      raise forms.ValidationError(

          'You need to accept the terms and condition for uploading the data.')

    return cleaned_data

  class Meta:

    model = Participant