Update git submodules
- Update skins/Vector from branch 'REL1_39' to 6c6c89aab2824bf607f9bbf40bce59934ed417d8
- Localisation updates from https://translatewiki.net.
Change-Id: I090034f10833ebbde1d1c91aeb86a6f2fdf73d08
- Localisation updates from https://translatewiki.net.