Fix incorrect translation key for parameter_not_allowed.detail

lib/jsonapi/exceptions.rb

@@ -402,7 +402,7 @@ def errors
                             status: :bad_request,
                             title: I18n.translate('jsonapi-resources.exceptions.parameter_not_allowed.title',
                                                   default: 'Param not allowed'),
-                            detail: I18n.translate('jsonapi-resources.exceptions.parameters_not_allowed.detail',
+                            detail: I18n.translate('jsonapi-resources.exceptions.parameter_not_allowed.detail',
                                                    default: "#{param} is not allowed.", param: param))]
       end
     end

test/unit/exceptions/translation_test.rb

@@ -0,0 +1,34 @@
+require File.expand_path('../../../test_helper', __FILE__)
+
+class TranslationTest < ActiveSupport::TestCase
+  setup do
+    @original_locale = I18n.locale
+  end
+
+  teardown do
+    I18n.locale = @original_locale
+  end
+
+  test "parameter_not_allowed translation is loaded correctly in another language" do
+    I18n.with_locale(:pt) do
+      I18n.backend.store_translations(:pt, {
+        "jsonapi-resources": {
+          exceptions: {
+            parameter_not_allowed: {
+              title: "Parâmetro não permitido",
+              detail: "%{param} não permitido."
+            }
+          }
+        }
+      })
+
+      param = "sort"
+      exception = JSONAPI::Exceptions::ParameterNotAllowed.new(param).errors[0]
+      expected_title = I18n.t("jsonapi-resources.exceptions.parameter_not_allowed.title")
+      expected_detail = I18n.t("jsonapi-resources.exceptions.parameter_not_allowed.detail", param: param)
+
+      assert_equal expected_title, exception.title
+      assert_equal expected_detail, exception.detail
+    end
+  end
+end