Fixes #4014 - Correctly use to_label when showing OSs

fixes #3937 - correct title wording Editing to Edit

Fixes #3927 - Allow VMs to provision via user-data

fixes #3967 - reworded message for OpenStack form

fixes #2542 - sort image listing with datatables

Feature #2368 - form helpers, exceptions and fixes

Feature #2368 - i18n extracting strings

fixes #2251 - adds openstack image listing

also refactor image list fetching

fixes #2229 add an IAM role field to a compute image.

This allows use of IAM to control access to AWS services within an instance.

removed the need to add 'btn' class for the action_buttons helper, and changed the action buttons to small.