I'm trying to book flights on TAP (TAP Airline Portugal -- aka. Take Another Plane) and this breakdown of the Miles&Go points being used for part of my booking shows a localization index "ancillaries.type.PREFERRED_BOARDING" rather than, ya know... the actual localization.

Now, I know that maintaining translations is hard, but typically, one would fallback to a default language (and Portuguese would be a fine option, in context). Falling back to the literal index name is.... a choice.