Update git submodules
- Update extensions/Renameuser from branch 'REL1_39' to 91b09d620970711756d34a4c783eb0759d666cfa
- Localisation updates from https://translatewiki.net.
Change-Id: I4164003a0344e3ddf931828b57cf14bc9bb008b5
- Localisation updates from https://translatewiki.net.