Can't add spell checker for a language other than English on Mac

[avner-hoffmann]

I tried to add spell checker to a language other than English, for example Hebrew. I tried all the following as written in the documentation, none of them worked:

1. window.spellCheckHandler.switchLanguage('he-IL');
2. window.spellCheckHandler.loadDictionaryForLanguageWithAlternatives('he-IL');

let dictionarySync = new DictionarySync();
dictionarySync.loadDictionaryForLanguage('he-IL');
window.spellCheckHandler = new SpellCheckHandler(dictionarySync);

What am I doing wrong?
This comment appears in the code: '// NB: OS X does automatic language detection, we're gonna trust it'
and then this.currentSpellcheckerLanguage is set to 'en-US'
I didn't manage to make it work for a language like Spanish as well, even when I add Spanish to my Mac's languages and keyboard layouts

I guess spell checker should work for other languages except English as well
Please help!

[ynaftali-vonage-zz]

@paulcbetts @felixrieseberg @CharlieHess @kwonoj @blaatunga @danmckeon @dudeofawesome
Can you help us here? Please 😊

[tomaskavalek]

Any news please? I have same issue.

[saenzramiro]

Same here!