I translated the January–July 1944 section of this war diary when working with Ferdinando D'Amico and Gabriele Valentini on Air War Italy 1944–45, using photocopies of the original (in the Bundesarchiv, Freiburg) kindly supplied by Jean-Louis Roba.
Later, I also translated the sections dealing with the Macchi 205 for an article by Ferdinando and Gabriele, I Veltro Dell'Asso Di Cuori, in the Italian aviation magazine JP4. For that I used the microfilm copies of the diary in the Imperial War Museum, London.
So far as I know, there isn't another English translation or I might have saved myself a lot of time and effort.
In places the handwriting of the original defeated me and it still does.
Translation and presentation