Did you install from 7.0 (chinese) media?
I believe if you install from 7.0 media (chinese) and then apply the pack that should do it.
If you have installed English version, you can download Language Pack from FileConnect:
https://fileconnect.symantec.com/
Select 'English' on 1st page, then enter your serial number.
The following list will be displayed:
| Product | Full Version | Language | Platform |
|---|---|---|---|
| Symantec NetBackup Server 7.0 - International English | 7.0 | International English | Cross-Platform |
| Symantec NetBackup Server 7.0 - Japanese | 7.0 | Japanese | Cross-Platform |
| Symantec NetBackup Server 7.0 - Simplified Chinese | 7.0 | Simplified Chinese | Cross-Platform |
| Symantec NetBackup Server 7.0 - French | 7.0 | French | Cross-Platform |
