UI labelling and cleanup

- [x] Forms action buttons should be: "Update {context}", "Delete" and "Create {context}" where {context} is "dataset", "group", "org", etc..
- [x] Cancel buttons on forms are unnecessary and if they need to be used should not be right next to submit buttons
- [x] Page action buttons should be "Manage" not "Edit" or "Admin"
- [x] Edit forms should have "save" + "delete" actions
- [x] Document `<title>` elements should reflect the actual content within the page (e.g. `Edit - {dataset title} - CKAN`)
- [x] Icons in buttons should be the same throughout the site:
 - Manage: `icon-wrench`
 - Create: `icon-plus-sign-alt`
- [x] Breadcrumbs should have `Manage` not edit on them 
- [x] Media listings don't need extra dotted border before them when with faceted search
- [x] `page_primary_action` should always be `btn btn-primary`
- [x] `content_action`  should always be just `btn`
- [ ] Also `* Required field` is displayed in strange positions on the edit package and org pages
- [x] User edit template are a little strange as well
- [x] Search in header should use standard `icon-search` and not custom icon image
- [x] Placeholders for search inputs also should have {context} in them: e.g. `Search datasets...` and not `Search`
- [x] `.flash-messages` needs more distinctive border as they fade into the background because of bad hue interaction

Also: concise beats verbose every time