Update git submodules
- Update extensions/CategoryTree from branch 'REL1_42' to a4eba01cee31deb88cbf128c7d583d51d4d10642
- Localisation updates from https://translatewiki.net.
Change-Id: I0ef28ce4739d8758fbd5108e1fe78488afbec6a6
- Localisation updates from https://translatewiki.net.