Updated mediawiki/extensions
Project: mediawiki/extensions/BookManagerv2  47f90b779ecc58a9fa45edcf9433f072cb03660b

Bug 50759: Use local image files instead of URLs.

Use local image files for the icons in the navigation bar, instead
of URLs to the images on commons. Also changed from using Chevron-left
and Chevron-right to Angle-left and Angle-right.

Bug: 50759
Change-Id: I0751f088b79346a8d5c3df58104e0b077ef54683