Update VE core submodule to master (f127451)

New changes:
e9cb138 Localisation updates from https://translatewiki.net.
bfae5fb Fix typo in documentation
54e688c Localisation updates from https://translatewiki.net.
f69bdbe Shut up warnings about calling cloneNode() with no parameters
f127451 Update OOjs UI to v0.1.0-pre (3db4b6974d)

Change-Id: Ie07c7c4cf023319e41025c11ab02dfc55f8d3145