Update git submodules
- Update extensions/VisualEditor from branch 'REL1_40' to 53849c87fd2ebdd3412f65b3e524afcaed5b29d1
- Localisation updates from https://translatewiki.net.
Change-Id: Ic99fe2308f13427b8a52c09155eda725144dd490
- Localisation updates from https://translatewiki.net.