Update VE core submodule to master (dd2398c)

New changes:
d635974 Use staging instead of undo in annotation inspector
29233b8 Localisation updates from https://translatewiki.net.
efb3296 Localisation updates from https://translatewiki.net.
cfc5ad1 Localisation updates from https://translatewiki.net.
c609e02 Update OOjs to v1.1.0
dd2398c Update OOjs UI to v0.1.0-pre (adfcf92c6a)

Change-Id: Id122cd8a266554fdbe9f10dcdf53d87c7dd21b17