Update git submodules
- Update extensions/Cite from branch 'REL1_39' to c784b18fa346f66f3399696458784bc0a0815456
- Localisation updates from https://translatewiki.net.
Change-Id: Ie8e4b5610822359fd5a7bf11c690f13d8edd5368
- Localisation updates from https://translatewiki.net.