Update git submodules
- Update extensions/Gadgets from branch 'REL1_42' to e69b59d9564f874df57eecef8e58924696fe9482
- Localisation updates from https://translatewiki.net.
Change-Id: I8dcba2abe8dd4305ffdc161d2076090954d7107e
- Localisation updates from https://translatewiki.net.