A translatewiki translator said that this ojb the more appropriate code for the existing translations, so it has to be added. The code ciw is valid, too, so it's preserved. The name "Ojibwemowin" is more appropriate for ojb, and ciw is now named "Anishinaabemowin". I also confirmed this with another Ojibwe language teacher. For more reference, see downstream task: https://phabricator.wikimedia.org/T281053