Scala supports Unicode characters in identifiers. It would be interesting to know your take on that.
Only known to be secure are java and cperl. rust followed my advise then for better unicode identifier security, but I haven't checked if they really promise some General Security Profile.
http://perl11.org/blog/unicode-identifiers.html
http://www.unicode.org/reports/tr39/ http://www.unicode.org/reports/tr36/#Security_Levels_and_Ale... http://www.unicode.org/reports/tr31/#Table_Candidate_Charact...
And in Plan 9 all compilers did. I bet this is the first exmaple of a humorous Hello world in C with Unicode smileys in identifiers: https://youtu.be/dP1xVpMPn8M?t=695, by Dennis Richie I think.
That's way internationalization is a lot harder than just applying a dictionary.