Update delivery date label
Update delivery date label

We referred to the first activity date which is a term used by the
legacy system.

This change uses a term more understandable term for users of this
system and non-native speakers.

uktrade/data-hub-frontend,uktrade/data-hub-fe-beta2,uktrade/data-hub-frontend,uktrade/data-hub-frontend,uktrade/data-hub-fe-beta2