Update VE core submodule to master (626f5ab)

New changes:
25257c1 Only show debug bar when ve.debug is set
7ec295b Use this.$() in LanguageResultWidget#highlightQuery
bc2bffc Handle collapsed range properly in pushRemoval
e4551c3 Update OOjs UI to v0.1.0-pre (c9b9f8345d)
bdf3b57 Inflict a gruesome death on ve.ce.getOffset() and reincarnate it
778ab84 Calculate offset correctly in inline slugs
38059f8 Localisation updates from https://translatewiki.net.
46bf0df Cleanup special character inspector CSS

Change-Id: If8f1913891d5a4d386dc13bb6d14d2c43be1eeaa