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Preserve existing $wgBabelCategoryNames configurations

Description

Preserve existing $wgBabelCategoryNames configurations

A custom configuration will overwrite the default one,
unless it's prepended with + in which case it will merge
the two (unlikely to be desired). Per 1ebb0f5659667fd34,
https://secure.php.net/manual/en/function.array-merge.php

Follow-up to 8c8adf671422ec311bc005031f5c5046860bb613.

Bug: T87883
Change-Id: If0cb5d9a303a28dc7d7f7bb7bcdf6263e63655e9

Details