Updated according to comments

app/models/pages_domain.rb

@@ -24,9 +24,9 @@ class PagesDomain < ActiveRecord::Base
     return unless domain
     if certificate
-      return "https://#{domain}"
+      "https://#{domain}"
     else
-      return "http://#{domain}"
+      "http://#{domain}"
     end
   end

app/services/projects/update_pages_service.rb

 module Projects
-  class
-  UpdatePagesService < BaseService
+  class UpdatePagesService < BaseService
     BLOCK_SIZE = 32.kilobytes
     MAX_SIZE = 1.terabyte
     SITE_PATH = 'public/'

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

-- page_title "Pages"
+- page_title 'Pages'
 %h3.page_title
   Pages
   - if Gitlab.config.pages.external_http || Gitlab.config.pages.external_https
-    = link_to new_namespace_project_pages_domain_path(@project.namespace, @project), class: "btn btn-new pull-right", title: "New Domain" do
+    = link_to new_namespace_project_pages_domain_path(@project.namespace, @project), class: 'btn btn-new pull-right', title: 'New Domain' do
       %i.fa.fa-plus
       New Domain
 %p.light
-  With GitLab Pages you can host for free your static websites on GitLab.
+  With GitLab Pages you can host your static websites on GitLab.
   Combined with the power of GitLab CI and the help of GitLab Runner
   you can deploy static pages for your individual projects, your user or your group.

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

@@ -10,22 +10,21 @@
       Domain
     .col-sm-10
       = f.text_field :domain, required: true, autocomplete: 'off', class: 'form-control'
-      %span.help-inline * required
   - if Gitlab.config.pages.external_https
     .form-group
       = f.label :certificate, class: 'control-label' do
         Certificate (PEM)
       .col-sm-10
-        = f.text_area :certificate, rows: 5, class: 'form-control', value: ''
+        = f.text_area :certificate, rows: 5, class: 'form-control'
         %span.help-inline Upload a certificate for your domain with all intermediates
     .form-group
       = f.label :key, class: 'control-label' do
         Key (PEM)
       .col-sm-10
-        = f.text_area :key, rows: 5, class: 'form-control', value: ''
-        %span.help-inline Upload a certificate for your domain with all intermediates
+        = f.text_area :key, rows: 5, class: 'form-control'
+        %span.help-inline Upload a private key for your certificate
   - else
     .nothing-here-block
       Support for custom certificates is disabled.

app/views/projects/pages_domains/new.html.haml

-- page_title 'Pages'
+- page_title 'New Pages Domain'
 %h3.page_title
   New Pages Domain
 %hr.clearfix

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

-- page_title "#{@domain.domain}", "Pages Domain"
+- page_title "#{@domain.domain}", 'Pages Domains'
 %h3.page-title
   Pages Domain