fixes summey / details blue bg
copy update

- editor config update
Merge pull request #515 from ministryofjustice/fixes/gh-issue-511

copy update
Merge pull request #513 from ministryofjustice/fixes/summery-details-blue-bg

fixes summary / details blue bg
fixes mobile layout for payment frequency buttons
added highlights for frequency buttons
Merge pull request #519 from ministryofjustice/issue/418

Issue/418
Cookies page
cookie page spec
Merge pull request #521 from ministryofjustice/fixes/gh-isssue-520

Fixes/gh isssue 520 Cookies page
Error messages: Representative
Error messages: Respondent
Error messages: claim details
Error messages: Returning
Copy update: start button and tests
Merge branch 'fixes/gh-issue-516' of github.com:ministryofjustice/atet into fixes/gh-issue-516