diff --git a/lib/pleroma/ecto_type/activity_pub/object_validators/content_language_map.ex b/lib/pleroma/ecto_type/activity_pub/object_validators/content_language_map.ex
new file mode 100644
index 000000000..2cc0fda00
--- /dev/null
+++ b/lib/pleroma/ecto_type/activity_pub/object_validators/content_language_map.ex
@@ -0,0 +1,49 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.ContentLanguageMap do
+  use Ecto.Type
+
+  import Pleroma.EctoType.ActivityPub.ObjectValidators.LanguageCode,
+    only: [is_good_locale_code?: 1]
+
+  def type, do: :map
+
+  def cast(%{} = object) do
+    with {status, %{} = data} when status in [:modified, :ok] <- validate_map(object) do
+      {:ok, data}
+    else
+      {_, nil} -> {:ok, nil}
+      {:error, _} -> :error
+    end
+  end
+
+  def cast(_), do: :error
+
+  def dump(data), do: {:ok, data}
+
+  def load(data), do: {:ok, data}
+
+  defp validate_map(%{} = object) do
+    {status, data} =
+      object
+      |> Enum.reduce({:ok, %{}}, fn
+        {lang, value}, {status, acc} when is_binary(lang) and is_binary(value) ->
+          if is_good_locale_code?(lang) do
+            {status, Map.put(acc, lang, value)}
+          else
+            {:modified, acc}
+          end
+
+        _, {_status, acc} ->
+          {:modified, acc}
+      end)
+
+    if data == %{} do
+      {status, nil}
+    else
+      {status, data}
+    end
+  end
+end
diff --git a/test/pleroma/ecto_type/activity_pub/object_validators/content_language_map_test.exs b/test/pleroma/ecto_type/activity_pub/object_validators/content_language_map_test.exs
new file mode 100644
index 000000000..a05871a6f
--- /dev/null
+++ b/test/pleroma/ecto_type/activity_pub/object_validators/content_language_map_test.exs
@@ -0,0 +1,56 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.ContentLanguageMapTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.EctoType.ActivityPub.ObjectValidators.ContentLanguageMap
+
+  test "it validates" do
+    data = %{
+      "en-US" => "mew mew",
+      "en-GB" => "meow meow"
+    }
+
+    assert {:ok, ^data} = ContentLanguageMap.cast(data)
+  end
+
+  test "it validates empty strings" do
+    data = %{
+      "en-US" => "mew mew",
+      "en-GB" => ""
+    }
+
+    assert {:ok, ^data} = ContentLanguageMap.cast(data)
+  end
+
+  test "it ignores non-strings within the map" do
+    data = %{
+      "en-US" => "mew mew",
+      "en-GB" => 123
+    }
+
+    assert {:ok, validated_data} = ContentLanguageMap.cast(data)
+
+    assert validated_data == %{"en-US" => "mew mew"}
+  end
+
+  test "it ignores bad locale codes" do
+    data = %{
+      "en-US" => "mew mew",
+      "en_GB" => "meow meow",
+      "en<<#@!$#!@%!GB" => "meow meow"
+    }
+
+    assert {:ok, validated_data} = ContentLanguageMap.cast(data)
+
+    assert validated_data == %{"en-US" => "mew mew"}
+  end
+
+  test "it complains with non-map data" do
+    assert :error = ContentLanguageMap.cast("mew")
+    assert :error = ContentLanguageMap.cast(["mew"])
+    assert :error = ContentLanguageMap.cast([%{"en-US" => "mew"}])
+  end
+end
diff --git a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
index a0c50b10d..c4e2aa838 100644
--- a/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/article_note_page_validator_test.exs
@@ -118,7 +118,7 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.ArticleNotePageValidatorTest
   end
 
   describe "Note language" do
-    test "it detects language from context" do
+    test "it detects language from JSON-LD context" do
       user = insert(:user)
 
       note_activity = %{