'Replyall' in Dutch is 'Beantwoord allen' and not 'Allen Beantwoord' which must come from some automatic translator or a non-native Dutch speaker.
Corrected
Thanx for the reply-all button. You should specify what goes wrong and what you tried to solve it...
I just put the to and cc fields of the original message in the cc field of the answer. The main problem was to have the "compose-cc" area be visible when there is something in it. I solved this using a global variable (in $GLOBALS), but there might be a better solution