Fix translateChoice warning in ReferenceField

[JulienMattiussi]

Issue

A warning is displayed about the boolean type of translateChoice prop in a ReferenceField.
But it's not an error, this type can be func or bool.

To reproduce

Use nested ReferenceField in a list view.

<List {...props} >
    <Datagrid>
      <DateField source="created_at" />
      <ReferenceField
        label="region_name"
        source="customer_id"
        reference="customers"
        link={false}
      >
        <ReferenceField
          source="customer_region_id"
          reference="customer_regions"
        >
          <TextField source="name" />
        </ReferenceField>
      </ReferenceField>
    </Datagrid>
  </List>

Solution

The type of translateChoice can be func or bool in PropTypes