i18N

resource/locales/en_US/admin/admin.json

@@ -28,7 +28,8 @@
     "update": "Update",
     "mail_settings": "E-mail Settings",
     "from_e-mail_address": "From e-mail address",
-    "send_test_mail": "send a test e-mail",
+    "send_test_email": "Send a test-email",
+    "success_to_send_test_email": "Success to send a test-email",
     "smtp_settings": "SMTP settings",
     "host": "Host",
     "port": "Port",

resource/locales/ja_JP/admin/admin.json

@@ -28,7 +28,8 @@
     "update": "更新",
     "mail_settings": "メールの設定",
     "from_e-mail_address": "Fromアドレス",
-    "send_test_mail": "テストメールを送信",
+    "send_test_email": "テストメールを送信",
+    "success_to_send_test_email": "テストメールを送信しました。",
     "smtp_settings": "SMTP設定",
     "host": "ホスト",
     "port": "ポート",

resource/locales/zh_CN/admin/admin.json

@@ -28,7 +28,8 @@
 		"update": "更新",
 		"mail_settings": "邮件设置",
 		"from_e-mail_address": "From e-mail address",
-    "send_test_mail": "send a test e-mail",
+    "send_test_email": "Send a test-email",
+    "success_to_send_test_email": "Success to send a test-email",
     "smtp_settings": "SMTP 设置",
 		"host": "服务器",
 		"port": "端口号",

src/client/js/components/Admin/App/SmtpSetting.jsx

@@ -35,7 +35,7 @@ function SmtpSetting(props) {
     const { adminAppContainer } = props;
     try {
       await adminAppContainer.sendTestEmail();
-      toastSuccess('Success to send test e-mail with smtp');
+      toastSuccess(t('admin:app_setting.success_to_send_test_email'));
     }
     catch (err) {
       toastError(err);
@@ -94,7 +94,7 @@ function SmtpSetting(props) {
               { t('Update') }
             </button>
             <button type="button" className="btn btn-secondary ml-4" onClick={sendTestEmailHandler}>
-              {t('admin:app_setting.send_test_mail')}
+              {t('admin:app_setting.send_test_email')}
             </button>
           </div>
         </div>