gistfile1.php

<?php

class Foo {
    protected $description_de = 'Beschreibung';
    protected $description_en = 'Description';

    protected $localizedProperties = array( 'description' );

    public function __get( $key ) {
        if ( !in_array( $key, $this->localizedProperties ) ) {
            throw new Exception( 'Unknown property');
        }

        return property_exists( $this,  $userProperty ) ? $this->$userProperty : $key . '_' . Locale::defaultLocale();
    }
}