Update git submodules
- Update skins/MinervaNeue from branch 'REL1_40' to 18670cd48cf845fe1337786f0396215a536c8105
- Localisation updates from https://translatewiki.net.
Change-Id: I7aad8c189ca1dc21449485633669cec136ed4978
- Localisation updates from https://translatewiki.net.