Customize the create package forms

* Change the word dataset to package in various places
* Fix inconsistent capitalization all over the place
* Change the help texts in the sidebars
* Remove the required fields stuff (it's just unnecessary clutter)
* Remove the open database license disclaimer
* Remove the format field (all our files are CSV)
Simplify the dataset read page

Replace "dataset" with "package"

Remove the page_header block that contained the tabs for Dataset,
Activity Stream and Related and the Manage button

Add an Edit button into the primary_content_inner block, now that we don't
have the one in the header anymore (also call it Edit instead of Manage)

Remove the "Additional Info" section (shows package extras)

Remove the package_info block from the sidebar, it just repeats the package
name and then has number of followers and follow button.

Remove the Explore button from resources

Change the subtitle "Resources" to "Data files"

Change the subtitle "Tags" to "Keywords"

Remove the href attributes from the tags themselves, so they don't link to
search pages

Change the title "Social" in the sidebar to "Share this package"
Change "Update package" button to "Save"

Matches the "Save" button when editing a resource (which I may also have
changed from the default label)
Tweak the dataset and resource edit pages

Mostly replacing the words dataset and resource with package and file.

A lot of this could be done in translations, instead of using form
customization.

Also hide the number of followers and the follow button from the sidebar
on dataset pages, and hide the file format from the sidebar when editing
resources.

There's still a javascript module with the words "Reorder resources" in
it, this has been changed in CKAN core (custom branch) for now but could
be done in a translation.
Simplify and tweak the resource read page

Change "Manage" to "Edit"
Change "Go to resource" to "Download"
Hide the resource URL
Hide the package's notes from the resource page (CKAN shows these when the
  resource has no description of its own)
Change "Additional Information" to "Additional fields"
Remove the "Show more" fields
Change "Resources" in sidebar to "Files"