Hi! :)
As for diacritics, the solution that worked for me was writing the words without them in the "pattern" fields (the user input) and then normally in the label/description fields (the displayed text). The engine just ignores special characters when inputting commands, so it works just fine with Hungarian.
And yes, the game loads only i18n.js, the other files are there just for reference, if I'm correct.
Also, if I'm not mistaken in the new version you should have translatable strings only in the i18n.js file.