Add username to billing page

Message about current plan should include username of the current user

ee/app/views/shared/billings/_billing_plan_header.html.haml

@@ -16,7 +16,7 @@
   %h4
     - plan_link = plan.about_page_href ? link_to(plan.code.titleize, plan.about_page_href) : plan.name
     - if namespace == current_user.namespace
-      = s_("BillingPlans|You are currently using the %{plan_link} plan.").html_safe % { plan_link: plan_link }
+      = s_("BillingPlans|@%{user_name} you are currently using the %{plan_link} plan.").html_safe % { user_name: current_user.username, plan_link: plan_link }
     - else
       = s_("BillingPlans|%{group_name} is currently using the %{plan_link} plan.").html_safe % { group_name: namespace.full_name, plan_link: plan_link }
 

ee/spec/features/billings/billing_plans_spec.rb

@@ -92,7 +92,7 @@ describe 'Billing plan pages', :feature do
 
       it 'displays header and actions' do
         page.within('.billing-plan-header') do
-          expect(page).to have_content('You are currently using the Bronze plan.')
+          expect(page).to have_content("#{user.username} you are currently using the Bronze plan.")
 
           expect(page).to have_css('.billing-plan-logo img')
         end
@@ -118,7 +118,7 @@ describe 'Billing plan pages', :feature do
 
       it 'displays header and actions' do
         page.within('.billing-plan-header') do
-          expect(page).to have_content('You are currently using the Gold plan.')
+          expect(page).to have_content("#{user.username} you are currently using the Gold plan.")
 
           expect(page).to have_css('.billing-plan-logo img')
         end

locale/gitlab.pot

@@ -2224,6 +2224,9 @@ msgstr ""
 msgid "BillingPlans|%{group_name} is currently using the %{plan_link} plan."
 msgstr ""
 
+msgid "BillingPlans|@%{user_name} you are currently using the %{plan_link} plan."
+msgstr ""
+
 msgid "BillingPlans|Current plan"
 msgstr ""
 
@@ -2257,9 +2260,6 @@ msgstr ""
 msgid "BillingPlans|Upgrade"
 msgstr ""
 
-msgid "BillingPlans|You are currently using the %{plan_link} plan."
-msgstr ""
-
 msgid "BillingPlans|Your GitLab.com trial expired on %{expiration_date}. %{learn_more_text}"
 msgstr ""