Update git submodules
- Update extensions/WikiEditor from branch 'REL1_39' to ccc7cc28788854c99e0b2c684d11a81f3fd97d2e
- Localisation updates from https://translatewiki.net.
Change-Id: I86a1217449e4b962a640911f074b5781010aec78
- Localisation updates from https://translatewiki.net.