Issue #154 - Style error messages

[hilarysk]

What does this PR do?

1. Styles in-page error messages
2. Standardizes success flash messages in controllers
3. Restyles radio buttons in submission new / edit form

Why was this work done? Is there a related Issue?

Issue #154

Where should a reviewer start?

Probably with the new error display partial

Are there any manual testing steps?

Attempt to edit or create anything.

Screenshots

Deployment instructions

N/A

Database changes

N/A

New ENV variables

N/A