Update git submodules
- Update extensions/Scribunto from branch 'REL1_39' to 4e8f19ac27f560a426a425b99969d2a3d2afdfb1
- Localisation updates from https://translatewiki.net.
Change-Id: I6866df70cc6c34dfeeffb7704c6deeede83faf8d
- Localisation updates from https://translatewiki.net.