Merge branch 'dz-rename-registry-tab' into 'master'

Shorter name for Container Registry tab

cc @markpundsack @jschatz1 

Based on https://gitlab.com/gitlab-org/gitlab-ce/issues/17983#note_12208183

See merge request !4430

app/views/layouts/nav/_project.html.haml

@@ -51,7 +51,7 @@
         = link_to project_container_registry_path(@project), title: 'Container Registry', class: 'shortcuts-container-registry' do
           = icon('hdd-o fw')
           %span
-            Container Registry
+            Registry
 
     - if project_nav_tab? :graphs
       = nav_link(controller: %w(graphs)) do