Translation of entfesseln

Work was performed only in June, July, August and September. In October and November, Erik has been waiting for Katja's visit and Sabine was on maternal leave after Christmas and New Year.
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'm fine, thanks. I'm sorry that I did not write back to you sooner. As you see I am very busy with my work. But I'll take the time to help you because I promised to do so. So let us start soon.