erp5_l10n_ja: Add a message for invoice system.

7 jobs for master in 0 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  External
failed ERP5.CodingStyleTest-Master

00:41:27

failed ERP5.PerformanceTest-Master

00:28:46

failed ERP5.UnitTest-Master

01:31:38

failed ERP5.UnitTest-Zope2

02:02:06

passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:48

passed SlapOS.Eggs.UnitTest-Master.Python3

00:16:17

passed Wendelin.UnitTest-Master

00:23:20