Copy updates

## Aside
- changed width
- updated copy on links

### To Do
- Update action heading

## /apply/application-number
- updated intro
- updated password text
Claimant's details
Multiple pages

- fees for multiple and single
- new locale entries
- specific copy for remission on single vs multiple
- updated hints
Updated tests

- updating the specs to reflect the changes so far
Hiding sign-out link

- changed memorable word to password
- updated aside copy
fixed test
Reminder page

- changed layout and copy
- updated tests
Merge pull request #385 from ministryofjustice/front-end/copy-updates-18-11

Front end/copy updates 18 11