Add name to user url
Move plot views together in file
Factor out scoped plot retrieval or 404
Add translation
Audit provide details when instance not found

This function requires instance to be set in order to avoid a runtime exception, but previously did not provide a meaningful exception. I ran into this while implementing delete_with_user on Plot and Tree.
Don't reuse variable names
Add support for deleting plots and trees on server

addresses #882 on github.