Fix Gettext warning

Author: solnic

test_integrations/phoenix_app/lib/phoenix_app_web/components/core_components.ex

@@ -15,9 +15,9 @@ defmodule PhoenixAppWeb.CoreComponents do
   Icons are provided by [heroicons](https://heroicons.com). See `icon/1` for usage.
   """
   use Phoenix.Component
+  use Gettext, backend: PhoenixAppWeb.Gettext
 
   alias Phoenix.LiveView.JS
-  import PhoenixAppWeb.Gettext
 
   @doc """
   Renders a modal.

test_integrations/phoenix_app/lib/phoenix_app_web/gettext.ex

@@ -20,5 +20,5 @@ defmodule PhoenixAppWeb.Gettext do
 
   See the [Gettext Docs](https://hexdocs.pm/gettext) for detailed usage.
   """
-  use Gettext, otp_app: :phoenix_app
+  use Gettext.Backend, otp_app: :phoenix_app
 end