Thank you once again, Nezih.
The Stardict es-en dictionary appears with the name "Sesotho" on my list of dictionaries on the screen of the Kobo instead of the name Stardict that I gave it and which it has when I open the list of dictionaries contained in the custom dictionary file of the Kobo on my computer. Sesotho/Stardict does recognise many forms of ESCAPAR but not the complex one of my text:ESCAPÁRSELES.
The Collins dictionary does seem to be fantastic for recognising complex verb forms in Spanish, but I don't have the Kindle version and I would be totally incapable of converting it: my technical ability is, unfortunately, very limited.
