Update git submodules
- Update extensions/AbuseFilter from branch 'REL1_39' to 37ff778fd3fce3d66a6713561f2b495c016d2fd1
- Localisation updates from https://translatewiki.net.
Change-Id: Icd7576f93282b278788feee61ec82e64be3e8e1a
- Localisation updates from https://translatewiki.net.