Quite by accident I found that the languages can be changed in the DB red Frankfurt Fulda Vectron. By pressing on the flag icon located on the left side of the upper row of either the center or right display, you get a menu with the choice of deutsch, english or netherlands. If you want the English, then press the '2' button on the bottom row and then the enter button the right side. Now everything on the displays is in English as well as the voice that 'scolds' you. This does not work with the Rail Pool 193 and I have not checked the Flix Train one.
This is build in with the ATB update by Foobian and will not carry over to the other models. Dutch is also present due to the available option of ATB.
This is amazing. It'll be a unique experience to drive a German locomotive with instruments labelled in english. Thanks for sharing