Fulltext Index Error With Query Word BARBE

For demonstration I created a fulltext index on table employee in Northwind database.

The following query gives an error:

SELECT * FROM employees
WHERE CONTAINS (FirstName, 'Barbe')

Replacing 'Barbe' by 'Barb' or other words it works fine.

The error message is (I have a french version of SQL installed, here the translation: "A clause in the query contains only ignored words"
Une clause de la requête ne contient que des mots ignorés)

Language for wordbreak in fulltext index is French and the error happens only with French, with English it works.

Is this a Microsoft bug?