Update VE core submodule to master (4743d59)

New changes:
82b7ecf Localisation updates from https://translatewiki.net.
a142762 Use unicorn client rect for adjacent collapsed selection
3ee5955 Add getDescription method to selections
d4be8ea Show entire expandable call tree in ve.ui.Filibuster
4743d59 Update OOjs UI to v0.2.4

Change-Id: Ic4ce5d8aff5a8b90cd541069cf22546940dd4b53