Use dedicated draft PR icon when possible (#20303)

* Use dedicated draft PR icon when possible

- Currently the generic pull-request icon is used for draft PR's. This
patch changes that by using the dedicated icon for this.
- Resolves #20296

* Use draft title

options/locale/locale_en-US.ini

@@ -1303,6 +1303,7 @@ issues.previous = Previous
 issues.next = Next
 issues.open_title = Open
 issues.closed_title = Closed
+issues.draft_title = Draft
 issues.num_comments = %d comments
 issues.commented_at = `commented <a href="#%s">%s</a>`
 issues.delete_comment_confirm = Are you sure you want to delete this comment?