A few other iids instead of ids (mostly in edit forms)

app/views/projects/issues/_form.html.haml

 %div.issue-form-holder
-  %h3.page-title= @issue.new_record? ? "New Issue" : "Edit Issue ##{@issue.id}"
+  %h3.page-title= @issue.new_record? ? "New Issue" : "Edit Issue ##{@issue.iid}"
   = form_for [@project, @issue] do |f|
     -if @issue.errors.any?
       .alert.alert-error

app/views/projects/merge_requests/edit.html.haml

 %h3.page-title
-  = "Edit merge request ##{@merge_request.id}"
+  = "Edit merge request ##{@merge_request.iid}"
 %hr
 = render 'form'

app/views/projects/milestones/_form.html.haml

-%h3.page-title= @milestone.new_record? ? "New Milestone" : "Edit Milestone ##{@milestone.id}"
+%h3.page-title= @milestone.new_record? ? "New Milestone" : "Edit Milestone ##{@milestone.iid}"
 .back-link
   = link_to project_milestones_path(@project) do
     ← To milestones

app/views/projects/milestones/_merge_request.html.haml

 %li
   = link_to [@project, merge_request] do
-    %span.badge.badge-info ##{merge_request.id}
+    %span.badge.badge-info ##{merge_request.iid}
   –
   = link_to_gfm truncate(merge_request.title, length: 60), [@project, merge_request]