Update git submodules
- Update extensions/WikiEditor from branch 'REL1_39' to ddd845077e78154a8123b9d1f95607030a0fc0c0
- Localisation updates from https://translatewiki.net.
Change-Id: I6f7077f2a750f93a7375631e60e7a8d27f08c228
- Localisation updates from https://translatewiki.net.