Just found that: % git grep 'Koha out on loan' installer/data/mysql/nb-NO/marcflavour/marc21/optional/marc21_sample_fastadd_framework.sql: ('952','q','Koha out on loan','Koha out on loan',0,0,'items.onloan',10,'','','',NULL,0,'FA','',NULL,NULL), installer/data/mysql/pl-PL/marcflavour/marc21/optional/marc21_sample_fastadd_framework.sql: ('952','q','Koha out on loan','Koha out on loan',0,0,'items.onloan',10,'','','',NULL,0,'FA','',NULL,NULL), No idea what happened.
Resolved by removal of language specific installer files. We create all frameworks from the same base files now.