[ticket/13097] Add missing unit type

PHPBB3-13097
Merge remote-tracking branch 'hanakin/ticket/13097' into develop-ascraeus

* hanakin/ticket/13097:
  [ticket/13097] Add missing unit type
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/13097] Add missing unit type