+// 'error.no_invoiceable_items' => 'There are no invoiceable items.',
+// 'error.no_login' => 'No user with this login.',
+// 'error.no_teams' => 'Your database is empty. Login as admin and create a new team.',
+'error.upload' => 'File feltöltési hiba.',
+// TODO: translate the following.
+// 'error.range_locked' => 'Date range is locked.',
+// 'error.mail_send' => 'Error sending mail.',
+// 'error.no_email' => 'No email associated with this login.',
+// '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.',