* Add new nationality columns
* Add nationality questions to lettings
* Add nationality questions to sales
* Infer nationality where appropriate
* Add synonyms
* Update csv exports
* Export nationality_all for 24/25
* Update prefers not to say value
* Set 24/25 nationality fields from BU
* Undo the export (there's a separate ticket)
* Correctly display answers
* Rebase fixes, tests and lint
* Set nationality from lettings BU 24/25
* Rename files, add synonyms and accents
* Fix sales csvs
* Extract constant
* create migration for new column
* create page class and add to household characteristics
* create question for buyer 2 nationality and associated test file
* fix failing test after added page
* rename method after code review
* add question number for the new question to allow CLDC-1864 to progress with fewer conflicts/complications