Updated mediawiki/extensions
Project: mediawiki/extensions/BookManager  94289948f98c7c291fdb80ccce442069e3939271

(bug 47509) Move left/right key navigation to bookmanager.js

Removed the jquery.hotkeys.js file. Added the left/right arrow key
navigation functionality to bookmanager.js.

Bug: 47509
Change-Id: I3e84198fdbb1a4212cee86f71e776b33f8e1a772