Updated layout.html and added simplified Chinese support

1.Replaced T("Articles") and T("Users") with plain text Articles and Users to be displayed.
2.Added simplified Chinese support.
Take Profile as an example:
![movuca](https://f.cloud.github.com/assets/2291859/582861/3312c91c-c8cd-11e2-91ce-7259f4e804df.jpg)