Comment 5 for bug 745243

Thanks for your bugreport.

I looked into this and was able to reproduce it if I only set my session to zh_CN but not the system wide language.

With a systemwide zh_CN setting (and a subsequent update-software-center call) I can see all the text translated.
I was not able to text the localized search (becauseI don't know what to input) but I assume it works as well as its using
the same data as the display. Attached are two screenshots from my box.

To make this work for non-systemwide setups software-center would have to build a index for each installed language.
We can add this feature if needed, it just means that the diskspace will increase and app-install-data package install
 speed will decrease.