Update git submodules
- Update extensions/SpamBlacklist from branch 'REL1_39' to 8a55c81bbcc5b584c6235c22060549b2cdb9d571
- Localisation updates from https://translatewiki.net.
Change-Id: I1492469c44ebfa91d5163b98df6f8953c605404e
- Localisation updates from https://translatewiki.net.