Change rails default error messages to use the rails-i18n gem
Currently, we use a local copy of the translations which is both partial and not updated if updates are added to the translations.
The gem is updated with translations that match the strings in the relevant rails version and contains many different locales that we do not currently have.
Any strings that need overriding from the default translation can be overridden by adding the relevant file to config/locales.
This gem version needs to be upgraded when changing the rails major version.