I suspect the locale isn't initialised properly from within the apipie-rails controller, as we normally do it in a before_filter on our own controllers.

Also I see this on http://foreman.example.com/apidoc/v2.html which I suppose ought to be English (there are also per-language pages).

Applied in changeset f3582159e2bc0cb5cd01741598e6f9a883d8fb9f.