Update git submodules
Update git submodules

* Update scripts/i18n from branch 'master'
  to 31db2e1a266093da608f4e52e9229e5acdcf6432
  - Localisation updates from https://translatewiki.net.
    
    Change-Id: I4e9b5b80e23bb33714ebb2c8eafafbacc21dccbf
    
wikimedia/pywikibot-core,wikimedia/pywikibot-core