Spechial chars, how to set charset?

Hello world! (best way to salute a C++ programmer)
I have created some buttons and labels with some text displayed on them. As long as the text is in english and no special characters are used they appear correctly. If I want to display some text like "español", "merçi" or the "" symbol weird characters appear instead of the special one "ñ, ç, €".
I suppose that this has to do something with the charset of the application. I don't know so much about this and I really need to change it so all the special and extended characters could appear. It could be UTF-8 but I don't know how to specify that the entire application should use this set.
Thanks for your help!
The charset depends on your environment, and I'm not sure if it's usually possible to change.
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