Code:
on 1:INPUT:#: {
  if ($left($1, 1) != $readini(mirc.ini, text, commandchar)) {
    /set -u0 %msg $1-
    /set %msg $replace(%msg, a, Ä, b, ß, c, ç, e, ë)
    ; etc etc etc etc
    /msg $chan %msg
  }
}