Bug in language conversion ?

[Jean-Pierre Chrétien]

Dear Developers

When I select section 4.10.1.1 in the French copy of Additional.lyx and convert 
it to French, I see that the optional argument of the list items remain 
untranslated. This trigger compilation errors like :

Missing \endscname inserted

because of the \foreignlanguage{} encapsulating the argument of the optional 
command.

This happens also at other places, where optional arguments are not translated. 
I can provide a more complete record about Additional.

-- 
Jean-Pierre