Bad french translation, for error message on the Datebox component

The error message for an incorrect input on a Datebox with the french locale, is wrong : "Vous devez specifiez une date. Format: jj/MM/aaaa HH:mm", the correct translation is : "Vous devez specifie+r+ une date. Format: jj/MM/aaaa HH:mm", the error is on the word "specifier", this is a verb and must be terminated with "er" in this case, and not "ez".

Thank you.