Updated mediawiki/extensions
Project: mediawiki/extensions/FirstSteps  f83b0add82260482de8e2dcaad733fcbeb223035

Complete initial FirstSteps import

Just the complement of I52d5959c3a08ad28193936b10401512c713bec27
with some file renames; minor changes split to another commit.

Change-Id: I7aed7dd5c2f8985ab6a7d45a18f6fce1d91ed8a9