Add back copy for existing gcp accounts within offer banner

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

@@ -6,7 +6,7 @@
       = image_tag 'illustrations/logos/google-cloud-platform_logo.svg'
     .col-sm-10
       %h4= s_('ClusterIntegration|Redeem up to $500 in free credit for Google Cloud Platform')
-      %p= s_('ClusterIntegration|Every new Google Cloud Platform (GCP) account receives $300 in credit upon %{sign_up_link}. In partnership with Google, GitLab is able to offer an additional $200 for new GCP accounts to get started with GitLab\'s Google Kubernetes Engine Integration.').html_safe % { sign_up_link: link }
+      %p= s_('ClusterIntegration|Every new Google Cloud Platform (GCP) account receives $300 in credit upon %{sign_up_link}. In partnership with Google, GitLab is able to offer an additional $200 for both new and existing GCP accounts to get started with GitLab\'s Google Kubernetes Engine Integration.').html_safe % { sign_up_link: link }
       %a.btn.btn-info{ href: 'https://goo.gl/AaJzRW', target: '_blank', rel: 'noopener noreferrer' }
         Apply for credit
 

changelogs/unreleased/existing-gcp-accounts.yml

+---
+title: Add back copy for existing gcp accounts within offer banner
+merge_request:
+author:
+type: changed