Update git submodules
- Update extensions/WikiEditor from branch 'REL1_40' to 6da5f526e088647a7fa10ed794d39108c0832b9b
- Localisation updates from https://translatewiki.net.
Change-Id: Iebfb3e0dcb301f5829e337f00690e27c7fbb52f8
- Localisation updates from https://translatewiki.net.