Thank you for your translation!
Even though translation work has begun, Habari hasn't got all the
internal plumbing to use it hooked up, yet. English is hardcoded as
the locale in the index.php file that is in the root of Habari's
install directory. If you open that file, find the line that says
Locale::set( 'en-us' );
and replace it with
Locale::set('zh-cn');
it may be enough for Habari to use your translation.
Rick