Save And Return

Rename reference to form_number
reinstate save and return page at start with memorable word
Email form number to recipient

todo: return to saved form page

Not keen on changing the domain language here. In the scope of this app this is the reference. The "claim reference" we show the user at the end is the fee group reference (FGR), but we still call it a FGR.

I'm -1 on changing this because the page copy has changed, especially as the copy is not stable, but mainly because I'm keen to keep our domain language constant so the team is on the same page at all times, changing the domain language risks wires getting crossed and causing confusion. The only thing we need to change here is the I18n string IMO.