Dear all,
There was an issue reported in Chinese support site about zh-hant problem with Gallery2 module. He changed the locale setting form zh-hant to zh-tw, and the Drupal/Gallery2 worked properly. (http://tw-drupal.info/node/301)
I don't know why we use zh-hant(zh-hants for simplified Chinese)? The zh-tw (zh-cn) is more popular in most programs.
sincerely, Charles