Update git submodules
- Update extensions/DiscussionTools from branch 'REL1_40' to 5829e43e4993c377f2c486479afd567b58bd73ac
- Localisation updates from https://translatewiki.net.
Change-Id: Ie35d5dcaea35a13d387a4e4b07070b0e4be3c23d
- Localisation updates from https://translatewiki.net.