Updated mediawiki/extensions
Project: mediawiki/extensions/Translate  9cd522e6ed7526bc6d8355ae514a92fda8789924

Reimplement beforeSubmit, afterSubmit and afterRegisterFeatures hooks

All three were present in pre- but not post-TUX JavaScript. Here, they
are recreated in a backwards-friendly way.

Change-Id: Ieae2148dfe2cd1b2e3005683c6e4b1eec3afb263