[davide_v]

It seems very nice, I tried japanese because I'm studying it, but it got difficult too quickly. In particular japanese needs furigana absolutely (the hiragana over kanji) or romaji (options to be activated/deactivated).

[ehnto]

Since it is in the browser, you could use the Yomichan browser extension to enable furigana/translation on hover.

[cwbuilds]

Got it. Will work out how to add this. Thanks for the feedback.