Make status.language == nil for 'und' value

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -225,7 +225,7 @@ def render(
       mentions: mentions,
       tags: reblogged[:tags] || [],
       application: build_application(object.data["generator"]),
-      language: object.data["language"],
+      language: get_language(object),
       emojis: [],
       pleroma: %{
         local: activity.local,
@@ -434,7 +434,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
       mentions: mentions,
       tags: build_tags(tags),
       application: build_application(object.data["generator"]),
-      language: object.data["language"],
+      language: get_language(object),
       emojis: build_emojis(object.data["emoji"]),
       pleroma: %{
         local: activity.local,
@@ -917,4 +917,8 @@ def build_source_location(%{"location_id" => location_id}) when is_binary(locati
   end
 
   def build_source_location(_), do: nil
+
+  defp get_language(%{data: %{"language" => "und"}}), do: nil
+
+  defp get_language(object), do: object.data["language"]
 end

test/pleroma/web/mastodon_api/views/status_view_test.exs

@@ -916,6 +916,16 @@ test "it shows post language" do
     assert status.language == "pl"
   end
 
+  test "doesn't show post language if it's 'und'" do
+    user = insert(:user)
+
+    {:ok, post} = CommonAPI.post(user, %{status: "sdifjogijodfg", language: "und"})
+
+    status = StatusView.render("show.json", activity: post)
+
+    assert status.language == nil
+  end
+
   test "with a source object" do
     note =
       insert(:note,