diff --git a/src/app.js b/src/app.js
index 68c6bde6..c3545d72 100644
--- a/src/app.js
+++ b/src/app.js
@@ -54,6 +54,14 @@ App.getLocales = function() {
 };
 
 
+/**
+ * @return {string} default locale
+ */
+App.getDefaultUILocale = function() {
+  return App.DEFAULT_LOCALE;
+};
+
+
 /**
  * @return {string} browser locale
  */
diff --git a/src/app/core/multipleshapeshelper.js b/src/app/core/multipleshapeshelper.js
index 3936dec8..22ef1470 100644
--- a/src/app/core/multipleshapeshelper.js
+++ b/src/app/core/multipleshapeshelper.js
@@ -1147,6 +1147,8 @@ thin.core.MultipleShapesHelper.prototype.createPropertyComponent_ = function() {
   
   var baseFormatInputProperty = new thin.ui.PropertyPane.InputProperty(thin.t('field_basic_format'));
   var baseFormatInput = baseFormatInputProperty.getValueControl();
+  baseFormatInput.setTooltip(thin.t('text_placeholder_of_base_format_description'));
+
   baseFormatInputProperty.addEventListener(propEventType.CHANGE, function(e) {
   
     var formatBase = e.target.getValue();
diff --git a/src/app/core/tblockshape.js b/src/app/core/tblockshape.js
index 831415a9..3d1cf11e 100644
--- a/src/app/core/tblockshape.js
+++ b/src/app/core/tblockshape.js
@@ -1317,6 +1317,8 @@ thin.core.TblockShape.prototype.createPropertyComponent_ = function() {
 
   var baseFormatInputProperty = new thin.ui.PropertyPane.InputProperty(thin.t('field_basic_format'));
   var baseFormatInput = baseFormatInputProperty.getValueControl();
+  baseFormatInput.setTooltip(thin.t('text_placeholder_of_base_format_description'));
+
   baseFormatInputProperty.addEventListener(propEventType.CHANGE,
       function(e) {
 
diff --git a/src/app/i18n.js b/src/app/i18n.js
index bd973b97..1b5872a0 100644
--- a/src/app/i18n.js
+++ b/src/app/i18n.js
@@ -41,6 +41,20 @@ thin.i18n.currentLocaleId_;
 thin.i18n.translations_;
 
 
+/**
+ * @type {Object}
+ * @private
+ */
+thin.i18n.defaultLocale_;
+
+
+/**
+ * @type {Object}
+ * @private
+ */
+thin.i18n.defaultTranslations_;
+
+
 /**
  * @param {string} name
  * @param {Object=} opt_values
@@ -49,7 +63,9 @@ thin.i18n.translations_;
 thin.i18n.translate = function(name, opt_values) {
   var i18n = thin.i18n;
   var msg = i18n.makeMessage_(
-      i18n.getMessages()[name], opt_values) || '';
+      i18n.getMessages()[name] || 
+        i18n.getDefaultMessages()[name], opt_values) || '';
+
   return goog.string.newLineToBr(goog.string.htmlEscape(msg));
 };
 
@@ -91,6 +107,19 @@ thin.i18n.getMessages = function() {
 };
 
 
+/**
+ * @return {Object}
+ */
+thin.i18n.getDefaultMessages = function() {
+  var i18n = thin.i18n;
+
+  if (!i18n.defaultTranslations_) {
+    i18n.defaultTranslations_ = /** @type {Object} */(i18n.defaultLocale_['messages']);
+  }
+  return i18n.defaultTranslations_;
+};
+
+
 /**
  * @return {string}
  */
@@ -133,6 +162,12 @@ thin.i18n.init = function() {
 
   i18n.currentLocaleId_ = localeId;
   i18n.currentLocale_ = locale;
+
+  var defaultLocaleId = thin.callApp('getDefaultUILocale');
+  i18n.defaultLocaleId_ = defaultLocaleId;
+  i18n.defaultLocale_ = goog.array.find(locales, function(loc) {
+    return loc.id == defaultLocaleId;
+  });
 };
 
 
diff --git a/src/locales/en.js b/src/locales/en.js
index b22ecda9..6a6b70ae 100644
--- a/src/locales/en.js
+++ b/src/locales/en.js
@@ -224,6 +224,7 @@ App.addLocale({
     text_apply_locale_setting: 'After reloading the Editor, the setting will be applied.\nDo you want to apply now?',
     text_layout_force_edit_confirmation: 'Because this layout has been created with a newer version, there is a risk of some configurations are broken by editing.\nAre you sure you want to edit anyway?',
     text_placeholder_of_pageno_description: '[Available Placeholders] {page}:Page Number, {total}:Total Page Count',
+    text_placeholder_of_base_format_description: '[Available Placeholders] {value}:The formatted value',
     text_counted_page_target_description: '[Allowed Targets] List (The ID of target List) or Report (Empty)',
     text_feedback_in_project_site: 'Project Site',
     text_feedback_in_github: 'GitHub Issues',
diff --git a/src/locales/ja.js b/src/locales/ja.js
index fc1ae05e..438cddb9 100644
--- a/src/locales/ja.js
+++ b/src/locales/ja.js
@@ -222,6 +222,7 @@ App.addLocale({
     text_apply_locale_setting: '設定を反映するにはエディタの再読み込みが必要です。\n今すぐ設定を反映しますか？',
     text_layout_force_edit_confirmation: 'このレイアウトは新しいバージョンのエディタで作成されているため、\n編集すると一部の設定情報が消失する可能性があります。\nそれでも開きますか？',
     text_placeholder_of_pageno_description: '[利用可能なプレースホルダ] {page}:ページ番号, {total}:総ページ数',
+    text_placeholder_of_base_format_description: '[利用可能なプレースホルダ] {value}:書式が反映された値',
     text_counted_page_target_description: '[指定可能な対象] リスト（対象リストID） or レポート（空）',
     text_feedback_in_project_site: 'プロジェクトサイトへ',
     text_feedback_in_github: 'GitHub Issues へ',