Update git submodules
- Update extensions/CategoryTree from branch 'REL1_40' to 54bfa1f8b605bfbcfe0b30f0b36784559c48ade8
- Localisation updates from https://translatewiki.net.
Change-Id: I1d88988bac712cab2874b2995642f86c6ce80e4f
- Localisation updates from https://translatewiki.net.