Update git submodules
- Update extensions/OATHAuth from branch 'REL1_39' to c6cf92dcc920a04af859a2587a38d7b933129b9f
- Localisation updates from https://translatewiki.net.
Change-Id: I17a426e4854f9336d048304456d7dd05a8b29c72
- Localisation updates from https://translatewiki.net.