Update git submodules
- Update extensions/CiteThisPage from branch 'REL1_42' to 1591d0e3e8a84e3f2f89cae48df3535116b7f7f0
- Localisation updates from https://translatewiki.net.
Change-Id: I05260b8dbe0b0563b3f95b6aee39d9d280025ef1
- Localisation updates from https://translatewiki.net.