Update git submodules
- Update extensions/Thanks from branch 'REL1_42' to f5531abf225dfaa60aecf88ef9f2f36eb580e3b9
- Localisation updates from https://translatewiki.net.
Change-Id: I785013471e17bfdb4c00b43aa3b475f7380b10a5
- Localisation updates from https://translatewiki.net.