(bug 47287) Configure $wgBabelCategoryNames for ca.wiktionary

This change adds configuration for $wgBabelCategoryNames for
the Catalan Wiktionary per community request; these are
basically the same settings that are used by the Catalan
Wikipedia, which is what was agreed upon by the community.

Bug: 47287
Change-Id: I40596a99d3ae60d0c9b7515aa3e92cceceb3bc68