test: fix api/v1/instance/translator_languages test

Somehow, this didn’t fail in OTP25 CI
(and OTP28 CI was borked in unrelated ways).

Fixes oversight in c1e70540b4

test/pleroma/web/mastodon_api/controllers/instance_controller_test.exs

@@ -110,6 +110,8 @@ defmodule Pleroma.Web.MastodonAPI.InstanceControllerTest do
   end
 
   test "get translation languages", %{conn: conn} do
+    clear_config([:translator, :enabled], true)
+
     Tesla.Mock.mock_global(fn
       %{method: :get, url: "https://api-free.deepl.com/v2/languages?type=source"} ->
         %Tesla.Env{
@@ -139,4 +141,17 @@ defmodule Pleroma.Web.MastodonAPI.InstanceControllerTest do
 
     assert %{"en" => ["ja"]} = response
   end
+
+  test "stubs out translation languages when no translator enabled", %{conn: conn} do
+    clear_config([:translator, :enabled], false)
+
+    conn =
+      conn
+      |> put_req_header("content-type", "application/json")
+      |> get("/api/v1/instance/translation_languages")
+
+    response = json_response_and_validate_schema(conn, 200)
+
+    assert %{} == response
+  end
 end