Account for singular user numbers

app/helpers/merge_requests_helper.rb

@@ -102,4 +102,9 @@ module MergeRequestsHelper
     count_text = organisation.users.count == 1 ? "1 #{organisation.name} user" : "all #{organisation.users.count} #{organisation.name} users"
     govuk_link_to "View #{count_text} (opens in a new tab)", users_organisation_path(organisation), target: "_blank"
   end
+
+  def total_users_after_merge_text(merge_request)
+    count = merge_request.total_visible_users_after_merge
+    "#{"#{count} user".pluralize(count)} after merge"
+  end
 end

app/views/merge_requests/user_outcomes.html.erb

@@ -10,7 +10,7 @@
 </h1>
 
 <% unless @merge_request.status == "request_merged" || @merge_request.status == "processing" %>
-  <h2 class="govuk-heading-m"><%= @merge_request.total_visible_users_after_merge %> users after merge</h2>
+  <h2 class="govuk-heading-m"><%= total_users_after_merge_text(@merge_request) %></h2>
    <p class="govuk-body">
     <%= merging_organisations_without_users_text(@merge_request.organisations_without_users) %>
   </p>