Tested with Firefox 3.6.23 + GXT build 2295.
If you create an enter field with a maximum length, and if the user enters more characters than specified, the french translation of the warning message is wrong.
With this example :
In English the message is ok : “The maximum length for this field is 10”.
In french the message is ko : “La longueur maximum de ce champ est de 10 caractère” : please could you replace this translation with “Le nombre maximum de caractères pour ce champ est 10 ».

Thanks for your help.