Halt creation of a user with a duplicate name

- Renders a 'confirm' template
Simplify link to Cancel in edit profile page
Simplify create profile spec
Create page 'Duplicates found'

- User 'Continues' to create a profile with a
duplicate name

- Or 'Returns' to the home page
Use translation text for Duplicate names prompt
Ensure an uploaded image persists across forms

- When checking for duplicates we need to
cache the profile image in the interstital form
Style the Duplicates found page