Update Turba to 2.0.4

Update Turba to 2.0.4
From the ChangeLog:
> Major changes compared to the Turba version H3 (2.0.3) are:
>     * Fixed adding contacts not restricted by edit permissions.
>     * Fixed warnings in the preference screen.
>     * Fixed warnings with PHP 4.4.0 and 5.0.5.
>     * Restored backward compatibility to older Horde versions.
>     * Updated Danish, Finnish, German, Hungarian, Korean, Polish and
>       Traditional Chinese translations.