writing a code for non-English speakers

Hello guys. I want to know how to setup and enable unicode for a program I wish to write for non-English speakers? Have searched forums but they do not directly answer my question.
Is it a command line program or a GUI program?
GUI
What environment/platform?
windows and mac
You first need to choose an suitable GUI framework (qt would be my first choice), and checkout unicode support on that platform.

You can discuss internationalization without knowing the platform and framework.
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