Update git submodules
- Update skins/MinervaNeue from branch 'REL1_39' to bf9593c6d7a29e2645c5e96f756cbfabf5750ae3
- Localisation updates from https://translatewiki.net.
Change-Id: Ieccdf54310350fd842c8563b1f2607caf4e0a1c0
- Localisation updates from https://translatewiki.net.