Translation of flackern in German-English

A proposal for our further cooperation: I will translate your texts in English and you translate my letters into Spanish. I will focus on spelling and grammar, and I will correct your sentence structure.
I've been working on and off on the dictionary during the entire week, and I'll spend some more hours on it this coming weekend. Sometimes he would get a bit mixed up and use formal Castilian sometimes instead of informal.
I wish you lots of fun and success in your French class, and a nice weekend with lots of snow. PS: I am so happy I found you, my Italian friend, because we can visit each other all the time now.