Update git submodules
- Update extensions/Cite from branch 'REL1_39' to c753737c5b379a2d0dba10a66c6d7c9bf12fff6c
- Localisation updates from https://translatewiki.net.
Change-Id: Icd7bd33f1a8a56135f6d5e17d877af3605d8e747
- Localisation updates from https://translatewiki.net.