Update git submodules
- Update skins/Vector from branch 'REL1_39' to 5a4ef970faa66d9398088e71f7134ec400a6b654
- Localisation updates from https://translatewiki.net.
Change-Id: I406b46e4df9429bddbf51ee0604b1c1c206d0f13
- Localisation updates from https://translatewiki.net.