Update VE core submodule to master (216941c)

New changes:
5b8bcb3 Update OOjs UI to v0.1.0-pre (1c5e409ab1)
7e09f7f Table demo
5f33b9c Update OOjs UI to v0.1.0-pre (f9c217dfa4)
34efe9e Localisation updates from https://translatewiki.net.
216941c Update OOjs to v1.1.1

Change-Id: I4b8cbad25385ea16caafa8884703196a428ac699