Update VE core submodule to master (5d94d8b)

New changes:
fc3be96 oojs-update.sh: Update to match version of script in mediawiki-core
1031079 update-oojs-ui.sh: Replace target dir instead of adding file copies
08fbae1 Add forgotten OOjs UI i18n files
5d94d8b Localisation updates from https://translatewiki.net.

Change-Id: I279d2f4b73134f7c95d8affe4191dc111b901809