I just saw that KOReader supports StarDict dictionaries. That's a good news since the previous converter had limitations and I just couldn't convert my 700mb XDXF to the Lingvo format without loosing too much stuff.
So, change of plans. Let's convert dictionary.com to a StarDict format that can be then read by KOReader on my PocketBook.
And... I'm almost there. StarDict files are all created and it works \o/
I just need to add the synonyms, either by using a .syn file or by adding the synonyms as regular word entries. Not sure yet.
Anyway I deleted my old project DictionaryDotComToXdxf from GitHub.
Instead, let me introduce offline_dictionary.com.