Update git submodules
- Update extensions/VisualEditor from branch 'REL1_39' to 38b63b854b24c67948250e60897b8e9fc6abff06
- Localisation updates from https://translatewiki.net.
Change-Id: I0ced3d9b4451593b89e52f7ad425a6a2a9d7f08b
- Localisation updates from https://translatewiki.net.