Update git submodules
- Update extensions/Echo from branch 'REL1_43' to 951879a4181162f93b2d409a5374bce785eaf8f2
- Localisation updates from https://translatewiki.net.
Change-Id: Id53684b396220015d3867a09d14355f8fceb9d88
- Localisation updates from https://translatewiki.net.