[Eric] Updated eric translation (zh_CN / Simplified Chinese)

[Boyuan Yang]

Hello Detlev,

I'm providing an update for Chinese (zh_CN) translation for eric. This update
may not be too significant but does fix several important translation errors.
I plan to make more updates in the upcoming months.

The .ts file was directly fetched from the hg repository. I'm providing the
updated .ts file as attachment. Please help commit it into the code
repository.

Thanks,
Boyuan Yang