Remove success_url this is not used
Don't use magic strings
Add translated label to form field
Fix bug in sql query
Simplify and centralise common logic for submission creation
Rename and relocate submission templates

--HG--
rename : submission/templates/submission/list.html => submission/templates/submission/starter/list.html
rename : submission/templates/submission/submissionstarter_detail.html => submission/templates/submission/starter/view.html