The International Component for Unicode (ICU) library can save you from being hopelessly mired in numerous character encodings as your C/C++ application matures into internationalization and localization.
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Learn about UTF-8 encoding of UNICODE characters.
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Adding multilanguage support to your application
Multilingual Applications - Switching Languages
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Onion Architecture addresses the challenges faced with 3-tier and n-tier architectures, and provides a solution for common problems.