Update git submodules
- Update extensions/Thanks from branch 'REL1_41' to 52b2c752bf4feff924a77972bc77c5bcb48bbe48
- Localisation updates from https://translatewiki.net.
Change-Id: I052b0685974de77131abc4443c13bcf2831337d4
- Localisation updates from https://translatewiki.net.