Update git submodules
- Update skins/MinervaNeue from branch 'REL1_39' to d75a6a8ef35abc18aa0b1db1cd302dc939f5ef02
- Localisation updates from https://translatewiki.net.
Change-Id: I18ace38b61b77761b0124ea0b7dc469cbcf73912
- Localisation updates from https://translatewiki.net.