(bug 44308) Add new namespaces and aliases on zhwikibooks

This commit does three things:
* (1) It adds 'CAT' as an alias for NS_CATEGORY;
* (2) It adds 'Wikijunior' and 'Subject' namespaces with their
respective talk namespaces as 110 and 112;
* (3) It adds three different aliases (in traditional Chinese,
simplified Chinese and two-letter abbreviations) for each new
namespace.

Note: there are currently around 190 pages in the main namespace
that start with 'Wikijunior:', so we'll need to run the
NamespaceDupes.php script to fix them after merging this patch.

Bug: 44308
Change-Id: I01cfd92d434f5134c6864a0e89802863f031eefb