Update VE core submodule to master (7af9774)

New changes:
b3e4c35 Localisation updates from https://translatewiki.net.
e0708f2 Show from/to of range in debug bar
a132724 Localisation updates from https://translatewiki.net.
d80b127 Localisation updates from https://translatewiki.net.
c81a3f3 Localisation updates from https://translatewiki.net.
7f90e0b Apply 'original size' to images

Change-Id: I14b7fc9c1b61b8a30e57eb366b06d1032b12d00a