Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  d26bf8632d6aa4ef9899a669e96f708c068ef7ac

Add flow specific exceptions

The purpose is not to show exception trace to the end users, because this is very
confusing.  This patch works by grouping flow exceptions into different categories,
with this, we can add different handling for the different exception types, we also
use the error code to present localized error message to users

Change-Id: I38e080cf38ed4e06ec319f766d19bd35f29aef9b