Update git submodules
- Update extensions/DiscussionTools from branch 'REL1_42' to 03911a17ec650e7ab2c71f4778d53cc2e340cf24
- Localisation updates from https://translatewiki.net.
Change-Id: I8b4d85da0a7202a8d1642c95544c3b358be8badb
- Localisation updates from https://translatewiki.net.