If you need to store non-english text in String variables, you will notice that it is difficult to change the case of unicode strings.
First try. Checking the utf8 support with hungarian accents in "árvíztűrő tükörfúrógép" and in uppercase: "ÁRVÍZTŰRŐ TÜKÖRFÚRÓGÉP." How to operate the MathJax plugin. I will test processing.js later.