diff --git a/config/locales/ja.yml b/config/locales/ja.yml
index 765f5314..aace7e2f 100644
--- a/config/locales/ja.yml
+++ b/config/locales/ja.yml
@@ -93,6 +93,7 @@ ja:
   label_overview_right: "Overview page, right"
   label_overview_top: "Overview page, top"
   label_pdf_wiki_settings: PDF Wiki settings
+  label_planning: Planning
   label_project_list: "プロジェクト一覧"
   label_project_overview_content: "Project guide"
   label_query_delete: Delete query
diff --git a/test/unit/i18n_test.rb b/test/unit/i18n_test.rb
index 0f145f84..248acc19 100644
--- a/test/unit/i18n_test.rb
+++ b/test/unit/i18n_test.rb
@@ -26,24 +26,13 @@ class I18nTest < Additionals::TestCase
     assert_equal 8, lang_files_count
     valid_languages.each do |lang|
       assert set_language_if_valid(lang)
+      case lang.to_s
+      when 'en'
+        assert_equal 'External urls', l(:label_external_urls)
+      when 'de', 'es', 'fr', 'it', 'ja', 'zh-TW', 'zh'
+        assert_not l(:label_external_urls) == 'External urls', lang
+      end
     end
-    # check if parse error exists
-    ::I18n.locale = 'de'
-    assert_equal 'Externe URLs', l(:label_external_urls)
-    ::I18n.locale = 'en'
-    assert_equal 'External urls', l(:label_external_urls)
-    ::I18n.locale = 'es'
-    assert_equal 'URLs externos', l(:label_external_urls)
-    ::I18n.locale = 'fr'
-    assert_equal 'Les urnes externes', l(:label_external_urls)
-    ::I18n.locale = 'it'
-    assert_equal 'Esterno urls', l(:label_external_urls)
-    ::I18n.locale = 'ja'
-    assert_equal '外部URL', l(:label_external_urls)
-    ::I18n.locale = 'zh-TW'
-    assert_equal '外部連結', l(:label_external_urls)
-    ::I18n.locale = 'zh'
-    assert_equal '外部 URLs', l(:label_external_urls)
 
     set_language_if_valid('en')
   end