Language.df table / How do I add custom characters?

[Clerco15]

In the language.df file it says you can add more languages on your own.

I've tried adding letters ?šž for Slovene (both lower and upper case) and I selected them in Character Set option but decoded messages containing those letters still replace them with a symbol.

That's how I added them


That's how it comes out (this particular word is poŽar so uppercase Ž which get's replaced with @)


Font is Courier New and I also installed the font on my system. I've tried it on both versions, v3.2b and v3.12 and get the same result.