Update git submodules
- Update extensions/CiteThisPage from branch 'REL1_39' to 6b05737671b91ad595460c7be1033968666f35ae
- Localisation updates from https://translatewiki.net.
Change-Id: I134efcb75ea3e14637f41a6da6504783adeddd0d
- Localisation updates from https://translatewiki.net.