Update git submodules
- Update extensions/Gadgets from branch 'REL1_40' to ade2e3ed66364697d1bdfab5f697230b7b0cdfbc
- Localisation updates from https://translatewiki.net.
Change-Id: I8aaf522a589e54eb89edb0e0fa22cf392b08cf1f
- Localisation updates from https://translatewiki.net.