I read mostly in French in Marvin and run across the following problem quite often.
Many articles ("the," "that," etc.) preceding French words that begin with vowels are apostrophized, as such:
The plane = L'avion
That he said = Qu'il a dit
And so on.
When you highlight one of these words with an apostrophized article in front of it, the word and the article are both highlighted. However, Apple's built-in dictionary doesn't recognize these words if the article precedes them. So you can define
écurie but not
l'écurie. That means I have to manually readjust the sliders on these words when I look them up to exclude the article and the apostrophe. It's a bit annoying and takes time.
Would it be possible for Marvin to recognize whether a book is in French by looking at the metadata, and for words looked up the dictionary, have the app ignore the apostrophe and everything in front of it? This is something that dedicated French dictionary apps, such as
Antidote, have managed to implement (though not with the default system dictionary).