Update git submodules
- Update extensions/DiscussionTools from branch 'REL1_42' to efb498d238b2962e3de50b28de0d12e36f291336
- Localisation updates from https://translatewiki.net.
Change-Id: I1f3b1728f9c12eda333cfdbadf2a79e7cb73f5ec
- Localisation updates from https://translatewiki.net.