Update VE core submodule to master (d52749b)

New changes:
c6e298f Localisation updates from https://translatewiki.net.
c5f083a Update IE detection to include Edge
aa026f0 Localisation updates from https://translatewiki.net.
543c929 Ignore enter key when no results.
8be322b Fix find and replace highlights in RTL
144c9ac ve.ce.Surface: Remove use of deprecated OO.ui.Element#onDOMEvent and #offDOMEvent
3ae9ba9 Update UnicodeJS to v0.1.2
b173384 navigator.appVersion -> navigator.userAgent
e9991c9 Papaparse update per https://github.com/edg2s/PapaParse/pull/2
461176e Localisation updates from https://translatewiki.net.

Change-Id: I7a3fed99a2559efe071ed515cb0b0d4ae627d05e