Center cluster title

app/views/projects/clusters/_empty_state.html.haml

@@ -3,7 +3,7 @@
     .svg-content= image_tag 'illustrations/clusters_empty.svg'
   .col-xs-12
     .text-content
-      %h4= s_('ClusterIntegration|Integrate cluster automation')
+      %h4.text-center= s_('ClusterIntegration|Integrate cluster automation')
       - link_to_help_page = link_to(s_('ClusterIntegration|Learn more about Clusters'), help_page_path('user/project/clusters/index'), target: '_blank', rel: 'noopener noreferrer')
       %p= s_('ClusterIntegration|Clusters allow you to use review apps, deploy your applications, run your pipelines, and much more in an easy way. %{link_to_help_page}').html_safe % { link_to_help_page: link_to_help_page}