I have used the built-in spell-checker in the Calibre editor, but it seems to be VERY limited in vocabulary. I often get lists of 1000s 'errors' — most of those only once or twice — which are simply words that are not included in the built-in dictionary. Many of those are verb contraction combined with another word. ['d 'll 're etc.] The spell-checker seems unable to figure out that those are really 2 viable words an an acceptable combination.
I often avoid using the spell-checker because I could spend hours and hours clicking on 'add this word to default dictionary' and then lose it all again if/when my computer crashes.
Is there any way to upgrade that default word listing to a really extensive dictionary (not for explanation of word meaning, but simply spell-check.) Please explain it in simple language, like pointing me to a file or plug-in and giving a step-by-step instruction to get it installed into the Calibre editor.
I've tried to search the forums, but translation dictionaries drown out everything else in the results I get.
TIA.