  # Choice types...
  
  class ChoiceField(Field):
      default_error_messages = {
          'invalid_choice': _('`{input}` is not a valid choice.')
      }
  
      def __init__(self, choices, **kwargs):
          # Allow either single or paired choices style:
          # choices = [1, 2, 3]
 
</s> remove         'invalid_choice': _('`{input}` is not a valid choice.'),
        'not_a_list': _('Expected a list of items but got type `{input_type}`.')
 </s> add         'invalid_choice': _("`{input}` is not a valid choice."),
        'not_a_list': _("Expected a list of items but got type `{input_type}`.") </s> remove         'invalid': _('`{input}` is not a valid boolean.')
 </s> add         'invalid': _("`{input}` is not a valid boolean.") </s> remove         'invalid': _('A valid integer is required.'),
        'max_value': _('Ensure this value is less than or equal to {max_value}.'),
        'min_value': _('Ensure this value is greater than or equal to {min_value}.'),
        'max_string_length': _('String value too large.')
 </s> add         'invalid': _("A valid integer is required."),
        'max_value': _("Ensure this value is less than or equal to {max_value}."),
        'min_value': _("Ensure this value is greater than or equal to {min_value}."),
        'max_string_length': _("String value too large.") </s> remove # raise serializers.ValidationError('Value was invalid')
 </s> add # raise serializers.ValidationError("Value was invalid") </s> remove         'invalid': _('Enter a valid email address.')
 </s> add         'invalid': _("Enter a valid email address.")
        'invalid_choice': _("`{input}` is not a valid choice.")
  # Choice types...
  
  class ChoiceField(Field):
      default_error_messages = {
        'invalid_choice': _("`{input}` is not a valid choice.")
      }
  
      def __init__(self, choices, **kwargs):
          # Allow either single or paired choices style:
          # choices = [1, 2, 3]
keep keep keep keep replace keep keep keep keep keep
 use double quotes for user visible strings; end user visible strings in full stops; add some missing translation tags 
rest_framework/fields.py