Update VE core submodule to master (1c1eb3a)

New changes:
7368ea3 Localisation updates from https://translatewiki.net.
712be31 Followup 682b4d0b88: bring this.isSetup back
78fd10e Document that SurfaceFragment#getSelectedNode doesn't require selection

Change-Id: I8df73bfc30b5bfeed88d5e96236991ce8bbae72d