How can I use a wordpress theme to show my own language characters?

Sorry I have no experience with wordpress. What I can tell you is that you want to change your character set (charset) to one that fits your needs (the set you are currently using doesn’t have a value for those letters and replaces it with �). Look for options or modules that will let you change the charset to a better suited one.

See this wiki entry on the replacement character � and this wiki entry on character encoding.

Hi! Thanks for the answer. Now, I have downloaded a hungarian wordpress zip file, I try to upload the engine as my own language, so it should be cool as well. If it does not working than I will try to modify charset.

just so you know, you should really used ascii code to show special characters like that.

heres a reference