Update VE core submodule to master (f294778e6)

Authored by Jdforrester-WMF on Mon, Mar 20, 3:36 PM.

Description

Update VE core submodule to master (f294778e6)

New changes:
642e86498 Localisation updates from https://translatewiki.net.
98608eb3d ce.test: Use nodeType constant
8e795e433 Fire a surface change event from the toolbar so tools can rebind

Bug: T160906
Change-Id: I9c3c65b43f3209049ba0ca7e587cc39fffc413d2