PowerGallery, as well as Powerstore 3 are highly customizable products, even for foreign characters like European languages (and to my knowledge, also for displaying Chineese ones). Good skills in PHP, AJAX, character encoding and decoding are of great advantage to find your way. So, if you're not a regular developer, find a friend who could assist you !
By the way, here are a few things to keep in mind when it comes to use the "specials" like Chineese characters (same for European ones):
a) the database, the tables, the text field collation and the connection collation should be set to utf8_unicode_ci (works best from my own experience with European "specials")
b) replace all "charset=utf-8" with the corresponding ISO for Chineese characters in the <meta> tags of every PHP file. Try ISO-2022-CN. It should work fine.
c) replace the "?xml version=\"1.0\" encoding=\"utf-8\" to "?xml version=\"1.0\" encoding=\"ISO-2022-CN\" in the xxxxxx_data1.php (and xxxxxx_data2.php) files contained in the DynamicWebCharts subdirectory.
You will also have to adjust or complete the number_format function in the PHP pages and make several other minor adjustments in the code.
Anyway WA has a great tech support and they help a lot to make us customize their products to our specific nedds.
If you have further questions regarding the "specials", so post them here.