Update VE core submodule to master (bb8d19c)

New changes:
9e674cb Add paste rules to surface widget config
57a1825 Localisation updates from https://translatewiki.net.
e3d279b Localisation updates from https://translatewiki.net.

Change-Id: I17539f856589e9c50c60ee737c8b16da63a41d6b