Updated mediawiki/extensions
Project: mediawiki/extensions/WikimediaMessages  7cfb84681b4e57a640f1456cf21adcf9c525424e

dding messages for the cc-by-4.0 and cc-by-sa-4.0 licenses.

Change-Id: If93c5e27c4a38a5229ede5694b36715d02ef6ede