(Stand back again) Even moar label manias! (label refactoring) + VE core update

Update VE core submodule to master (84ced37) and update calling code
for changes in OOUI.

Depends on Ic967b88d55daf48d365487e17f76488b3f02c60f and Ib599b9bd5028e2df084fcc3da657aeb7f1569d2a

New changes:
94f03c3 Undefined variables first in selectNodes
62b5648 Localisation updates from https://translatewiki.net.
10c5a18 Don't descend into handlesOwnChildren nodes in selectNodes
4ed2432 Update jquery.client to MW's master (45192156d7)
d7e24b8 Localisation updates from https://translatewiki.net.
babb9da Localisation updates from https://translatewiki.net.
4639d18 Localisation updates from https://translatewiki.net.
a561537 Localisation updates from https://translatewiki.net.
8f7053a Localisation updates from https://translatewiki.net.
7112cc2 Update OOjs UI to v0.1.0-pre (a290673bbd)

Change-Id: Ie7d58472619509782f23a7dedc1ec27c3dcc7543
Merge "(Stand back again) Even moar label manias! (label refactoring) + VE core update"