Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  f41173a1522120104f1f652f23fb7fe53e25831d

Fix MediaWikiExtensionFFS exporting

Broken when removing SingleMessageGroup class, fixed by applying an
override copied from PythonSingleFFS.

Change-Id: I1700b4909e181a6678865ec745e7e75d8b93625f