Plural instead of singular.

app/views/doorkeeper/applications/show.html.haml

-- page_title @application.name, "Application"
+- page_title @application.name, "Applications"
 %h3.page-title
   Application: #{@application.name}

app/views/groups/milestones/show.html.haml

-- page_title @group_milestone.title, "Milestone"
+- page_title @group_milestone.title, "Milestones"
 %h4.page-title
   .issue-box{ class: "issue-box-#{@group_milestone.closed? ? 'closed' : 'open'}" }
     - if @group_milestone.closed?

app/views/snippets/show.html.haml

-- page_title @snippet.title, "Snippet"
+- page_title @snippet.title, "Snippets"
 %h3.page-title
   = @snippet.title