Update git submodules
- Update extensions/CategoryTree from branch 'REL1_39' to 9fa43349af1ba324c19d4a5647818166bd62a979
- Localisation updates from https://translatewiki.net.
Change-Id: Ic3378afbca60cdd97ec1b9a84271427b041168f2
- Localisation updates from https://translatewiki.net.