Updated mediawiki/extensions
Project: mediawiki/extensions/LocalisationUpdate  6a33a210860df05debd001d6b9c7933e31f99d08

Update README

 * Renamed README_FIRST.txt to README
 * Updated extension installation steps

Change-Id: I9aac0c7a5f6a78c7aa08c945a6830f216d359bbd