The category: pages (along with all other namespaced pages) were deliberately stripped out. This was because most of them are not useful (eg help pages), and some of them are huge and caused problems during compiling. since a few other compile bugs have been fixed, it may be possible to re-enable the category pages, i'll look in to it.

we can also look in to the missing articles. please let us know if there are any more you find. if you could file an issue at https://bitbucket.org/itkach/aardtools/issues/ that would make sure it does not get forgotten.

Is there anyone wanting non english wikipedias?