Format
Simplify variable names
Small change for consistency
Fix view template file names
Remove unused routes participants_to_approve
Fix things
Remove unused code
Improve 'update' actions for talks and hotels

Improve route actions for updating talks and hotels, add attribute lists, localisations for flash messages, and methods for extracting parameters.
Experiment with CSS button styles
Small presentation variations
Rename participant partials /_in_index/_details/
Re-use participant details in index and show
Allow to store, view, and edit talks and hotels