(:WAV)hi!
thanks for your post, but unfortunately I'm afraid it is impossible to rename those strings, as they are thunderbird extensions. If the string name was changed, thunderbird would not be able to recognize the extension anymore, and if it did,which I doubt, it would not be able to update it when necessary.
thanks anyway (you might be right on the fact that the length of the string could cause a problem to cpf, but I can't change the strings, cpf must change...).