NXD Show ICP on front page & on footer of every other pages

TODO detect whether request comes from China and only then show ICP (?).

app/helpers/page_layout_helper.rb

@@ -199,5 +199,12 @@ module PageLayoutHelper
     # `fullpath` would return the path without the slash.
     # Therefore, we need to process `original_fullpath`
     request.original_fullpath.sub(request.path, '')[0] == '/'
+  def should_render_icp?
+    extra_config.has_key?('ICP')
+    # TODO render ICP only for requests from China
+  end
+
+  def render_icp
+    link_to extra_config.ICP, "http://www.miibeian.gov.cn/"
   end
 end

app/views/devise/shared/_footer.html.haml

@@ -6,4 +6,5 @@
       = link_to _("Help"), help_path
     = link_to _("About GitLab"), "https://about.gitlab.com/"
     = link_to _("About Nexedi"), "http://www.nexedi.com/"
-= footer_message
+    - if should_render_icp?
+      = render_icp

app/views/layouts/_page.html.haml

@@ -33,3 +33,6 @@
     = link_to "About GitLab", "https://about.gitlab.com/"
     |
     = link_to "About Nexedi", "http://www.nexedi.com/"
+    - if should_render_icp?
+      |
+      = render_icp

config/gitlab.yml.example

@@ -1274,6 +1274,9 @@ production: &base
     ## https://docs.gitlab.com/ee/user/project/highlighting.html
     # maximum_text_highlight_size_kilobytes: 512
 
+    ## Site ICP number
+    # ICP: '_your_site_icp_'
+
   rack_attack:
     git_basic_auth:
       # Rack Attack IP banning enabled