(bug 47749) Categorise {{#babel}} on udmwiki

This patch adds necessary configuration for {{#babel}} on
the Udmurt Wikipedia per request (and community approval).
I'm also using the opportunity to add some missing config
for $wgBabelMainCategory for bug 47287 and bug 46489
(cawiktionary and ukwikinews).

Bug: 47749
Change-Id: Ib24830722a82dfad95fffc4f4d141366216aaec5