Thanks for your review. We have to rely on the community when it comes to adding new languages. Unfortunately, adding support for a new language is more complicated than adding a list of words, which limits the number of people willing to work on this.

About this website (addons.mozilla.org) not working - it's a hard restriction by Firefox. As far as I know, no add-on that requires access to the HTML page will work on addons.mozilla.org.