Update git submodules
- Update skins/Vector from branch 'REL1_39' to 6158e5cc806ac87e1e72c074388240eb616f6924
- Localisation updates from https://translatewiki.net.
Change-Id: I34bbaeb4208f118908711fa84765324f853a7289
- Localisation updates from https://translatewiki.net.