Use a custom title in the revert modal.

app/views/projects/commit/_revert.html.haml

@@ -3,7 +3,7 @@
     .modal-content
       .modal-header
         %a.close{href: "#", "data-dismiss" => "modal"} ×
-        %h3.page-title Revert commit
+        %h3.page-title== Revert: "#{title}"
       .modal-body
         = form_tag revert_namespace_project_commit_path(@project.namespace, @project, commit_id), method: :post, remote: false, class: 'form-horizontal js-create-dir-form js-requires-input' do
           .form-group.branch

app/views/projects/commit/show.html.haml

@@ -13,4 +13,4 @@
          diff_refs: @diff_refs
 = render "projects/notes/notes_with_form"
 - if can_collaborate_with_project?
-  = render "projects/commit/revert", commit_id: @commit.id
+  = render "projects/commit/revert", commit_id: @commit.id, title: @commit.title

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

@@ -86,7 +86,7 @@
 
 = render 'shared/issuable/sidebar', issuable: @merge_request
 - if @merge_request.merge_commit_sha
-  = render "projects/commit/revert", commit_id: @merge_request.merge_commit_sha
+  = render "projects/commit/revert", commit_id: @merge_request.merge_commit_sha, title: @merge_request.title
 
 :javascript
   var merge_request;