Simplified Chinese Language Pack （简体中文包）

Upload the 2 folders inside this archive directly in the opencart root

Login your opencart admin and go to system > localisation > languages

Insert a new language, Complete the form as follow:

Language Name: Chinese
Code: cn
Locale: zh,zh-hk,zh-cn,zh-cn.UTF-8,cn-gb,chinese
Image: cn.png
Directory: chinese
Filename: chinese
Status: Enabled

To make the Chinese language as the default one , in your admin go to system > settings > click edit on your store > then go to the tab Local , select the language "chinese" and save it.
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Any questions post to
http://forum.opencart.com/viewtopic.php?f=64&t=65297