#2947 - PR followup for deleteresource.

* Removed nl_NL bundle as others can probably translate it better.
* Cleaned up JSDoc
* Moved all i18n keys into the template.
* Created keys per resource type/resource subtype
* Added a caution message
Made the oae.list.getSelection widget-aware.
Issue 2867 followup

 * If only 1 item is being removed, show link/file/collabdoc thing
 * Cleaned up CSS & HTML
 * Cleaned up JS