Language-neutral abbreviation ('1'..'5'); empty for 0/98/99 (use the name).
Reading-view / chart CSS class, e.g. "status1".
Localized label with a level suffix for learning stages, e.g. "Learning (1)".
Localized base name, e.g. "Learning", "Learned".
Position in STATUS_DISPLAY_ORDER (0-based).
A status and its display metadata.