// TODO: translate the following stings.
// 'form.invoice.invoice_to_delete' => 'Invoice to delete',
// 'form.invoice.invoice_entries' => 'Invoice entries',
+// 'form.invoice.confirm_deleting_entries' => 'Please confirm deleting invoice entries from Time Tracker.',
// Charts form. See example at https://timetracker.anuko.com/charts.php
// TODO: translate form.charts.interval and form.charts.chart.