feat: unify page titles

lib/mv_web/controllers/join_confirm_controller.ex

@@ -8,6 +8,8 @@ defmodule MvWeb.JoinConfirmController do
   """
   use MvWeb, :controller
 
+  use Gettext, backend: MvWeb.Gettext
+
   def confirm(conn, %{"token" => token}) when is_binary(token) do
     callback = Application.get_env(:mv, :join_confirm_callback, Mv.Membership)
 
@@ -48,8 +50,15 @@ defmodule MvWeb.JoinConfirmController do
   end
 
   defp assign_confirm_assigns(conn, result) do
+    page_title = page_title_for_result(result)
+
     conn
     |> assign(:result, result)
+    |> assign(:page_title, page_title)
     |> assign(:flash, conn.assigns[:flash] || conn.flash || %{})
   end
+
+  defp page_title_for_result(:success), do: gettext("Join confirmation")
+  defp page_title_for_result(:expired), do: gettext("Link expired")
+  defp page_title_for_result(:invalid), do: gettext("Invalid link")
 end