Update git submodules
- Update BlueSpiceGroupManager from branch 'master' to b23039203113c94237de2be6858eec9bc95a74af
- Localisation updates from https://translatewiki.net.
Change-Id: Ieff009b6224a2159a83c0f4bcf7a06811d60a7a4
- Localisation updates from https://translatewiki.net.