Palmerston Island; Cook Islands ; Sprachenpolitik; Language management; Language politics ; Sprachbewahrung; Ethnolinguistic vitality; Vitality, ethnolinguistic; Sprachwechsel; Language shift; Heritage language; Language maintenance ; Sprachentod; Extinct language; Language endangerment; Bedrohte Sprache; Linguicide; Linguizid; Language death ; Pitkern-Norfolk; Norfolkesisch; Norfolkese; Norf'k; Norfolk Island English; Pitcairn English