Fons wrote:only in German.
What luck you were not in Finland....
Well, you could write to them, indicating the "Aktenzeichen" or what reference else. You may use the sender's adress, and maybe there is also a name of an "Bearbeiter" or "Sachbearbeiter" or so. In the adress you mention "zu Händen von" and then this name.
Such, your letter should arrive.
I do not know, however, how they will tackle the linguistic problem. It is, after all, an authority, and not a private company. Wonder if they are willing to write that same stuff in english respectively if the person in charge masters English well enough.
Maybe the part that you do not understand indicates that you may have a certain time to give your statement or to appeal against this fine.
But if you must admit that you really have been exceeding speed, pay and "let God be a good man". Anything else will cause you more cost, loss time and energy.
Meine Angst, dass die Autokorrektur einmal etwas Obszönes ausspuckt, wichst täglich.