http://www.opencart.com/index.php?route=extension/extension/info&extension_id=15172
Http://www.opencartchina.com/extension119.html
Http://www.opencart.com.hk/index.php?route=extension/extension/info&extension_id=12
1. Download the language pack and unzip it as shown in:
2. After the extracted directory Opencart_v2.0.x_simplified_chinese, there will be the following two directories:
3. Use the FTP tool to upload these two directories to your site's root directory and merge with your site's existing directory with the same name.
4. Login to the website backstage, visit the Add new language, localisation, Languages, System---The following interface appears:
After filling in the relevant parameters, click Save in the upper right corner.
5. If you want to set the background interface language is Simplified Chinese, then visit the website backstage System--Settings, edit the specific store, the following page appears:
Select the Simplified Chinese language in the administration language drop-down list and save it.
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OpenCart v2.x Chinese Language Pack Installation tutorial