Translation of Arktis

It looks like we need to invite Erika again to my home, once the cake is ready. Of course, this should be done before Sunday to stay in the chocolate cake race. We should buy cream too.
You wrote the first one 2 weeks ago. I was just thinking that 'LUCARAS' is a brandname, while the dictionary is a type. In plural, formal address would be 'vosotros' in Spain, and 'ustedes' in most of the Spanish speaking world.
I think it is better to send an e-mail. Unfortunately, I have not received any response from you. I have answered your last letter a month ago. I would like to correct your mistakes.