Update git submodules
- Update extensions/Gadgets from branch 'REL1_42' to 9ddc0cc60a40357b22727430f7fe6e2720e0307d
- Localisation updates from https://translatewiki.net.
Change-Id: I8cfa7c1cae4b91e52047b0fdfcbaac075d55bf10
- Localisation updates from https://translatewiki.net.