Update git submodules
- Update extensions/CiteThisPage from branch 'REL1_39' to a0c8b8ebb1592582b5adfe0ad86754a7802324a2
- Localisation updates from https://translatewiki.net.
Change-Id: Ib63c2b84c9e6b33451202b10974f9a6a2bf42db1
- Localisation updates from https://translatewiki.net.