in PHP, ngettext doesn't work in the native langage.
If I code :
printf( ngettext( '%d article avalaible', '%d articles avalaible', 0), 0);
It will return in English (native langage) :
0 articles avalaible
But return the correct form in French (translated with poedit):
0 article disponible
I don't understand why....
OK there is no problem, just my mistake.
In French when we have a 0, we don't have to put the word in plural. In English, with zero items, we have to put items in plural.