Support translateLocally translation provider

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

test/pleroma/language/translation/translate_locally_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2024 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Language.Translation.TranslateLocallyTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Language.Translation.TranslateLocally
+
+  @example_models %{
+    "de" => %{
+      "en" => "de-en-base"
+    },
+    "en" => %{
+      "de" => "en-de-base",
+      "pl" => "en-pl-tiny"
+    },
+    "cs" => %{
+      "en" => "cs-en-base"
+    },
+    "pl" => %{
+      "en" => "pl-en-tiny"
+    }
+  }
+
+  test "it returns languages list" do
+    clear_config([Pleroma.Language.Translation.TranslateLocally, :models], @example_models)
+
+    assert {:ok, languages} = TranslateLocally.supported_languages(:source)
+    assert ["cs", "de", "en", "pl"] = languages |> Enum.sort()
+  end
+
+  describe "it returns languages matrix" do
+    test "without intermediary language" do
+      clear_config([Pleroma.Language.Translation.TranslateLocally, :models], @example_models)
+
+      assert {:ok,
+              %{
+                "cs" => ["en"],
+                "de" => ["en"],
+                "en" => ["de", "pl"],
+                "pl" => ["en"]
+              }} = TranslateLocally.languages_matrix()
+    end
+
+    test "with intermediary language" do
+      clear_config([Pleroma.Language.Translation.TranslateLocally, :models], @example_models)
+      clear_config([Pleroma.Language.Translation.TranslateLocally, :intermediary_language], "en")
+
+      assert {:ok,
+              %{
+                "cs" => ["de", "en", "pl"],
+                "de" => ["en", "pl"],
+                "en" => ["de", "pl"],
+                "pl" => ["de", "en"]
+              }} = TranslateLocally.languages_matrix()
+    end
+  end
+end