+'error.no_email' => '본 로그인과 연계된 이메일이 없습니다',
+// TODO: translate the following.
+// 'error.uncompleted_exists' => 'Uncompleted entry already exists. Close or delete it.',
+// 'error.goto_uncompleted' => 'Go to uncompleted entry.',
+// 'error.overlap' => 'Time interval overlaps with existing records.',
+// 'error.future_date' => 'Date is in future.',