l10n_fr: fix typo

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Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:39:37

failed ERP5.UnitTest-Master

01:10:27

failed ERP5.UnitTest-Master.Medusa

01:14:52

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:20

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:05