Update git submodules
- Update extensions/Thanks from branch 'REL1_40' to 50ded8e211ffd0264fb294e2c3008054b1cbf1e8
- Localisation updates from https://translatewiki.net.
Change-Id: I09a160eed8c61df24a88f851af6db3e59817448a
- Localisation updates from https://translatewiki.net.