Update git submodules
- Update extensions/WikiEditor from branch 'REL1_42' to 56b83f607adbee06bf9fff6ffe33843ce159cce5
- Localisation updates from https://translatewiki.net.
Change-Id: I0f0f5457ae1e16db734c0bf7e20f7ac78c10d1e0
- Localisation updates from https://translatewiki.net.