[#87976] Avoid order import error cookie overflow

* Truncate overlong error messages before adding to flash
* Add specs for flash messages
* Refactor order import controller specs

Closes #242
[#87976] Avoid journal creation cookie overflow

* Reduce create maximum error message size from 3000 to 2000
* Reduce the size of the individual journal create error messages
* Consolidate duplicate error messages
* Shorten and localize account error messages
* Reconcile differences in #create_journal_rows! with the NU fork

Closes #242