Check Chinese version and keep consistent with English version.

Reported by Huxing Zhang in @dev mailing list:

>
> I went through the very first chapters of user manual and I think the
> Chinese version is not updated to the English version.
>
> For example in Chapter 3 dependencies. The Chinese version says it
> requires Java 5+ while in the English version says it requires Java
> 6+.
>
> Meanwhile the detailed dependencies in Chapter 3 are not synced.