Update git submodules
- Update skins/MinervaNeue from branch 'REL1_42' to 6b1d02c6d35366297fb8957289c124493cba6257
- Localisation updates from https://translatewiki.net.
Change-Id: Ied8ff2534c943500b9b9490654ffb350f329ce1f
- Localisation updates from https://translatewiki.net.