This fixes issues related to the search date picker.

* Removed the `public/index.html` page so the default routing works correctly.
* Renamed `dashboard.js.coffee` to `dashboard.js` and removed the CoffeeScript comments.
* Moved the jQuery code used to attach the datepicker into `dashboard.js`.
* No longer setting the date format using Javascript.
* Added the data attribute `data-date-format` in the `dashboard/index` view to set the date picker's date format.
* Now only loading the English translation for the date picker.