Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  bdf357477baba46fc7849e9aa9a80a71489fd41a

Put group message caches into subdirectories

Having 60k files in one directory makes it hard and slow to work with

Includes automatic migration, but dropped support for years old version
format 2.

Change-Id: I02e421941ad68e91f3627baa56870f515389bb1b