This thread is resolved. Here is a description of the problem and solution.
Problem: after importing content from Polylang to WPML, content with zh-tw language code became zh-hans (Semplified Chinese), but I need them in zh-hant (Traditional Chinese)
Solution: 1. Add Traditional Chinese in WPML -> Languages -> Add language (it's already pre-built with WPML so you only need to check the box) 2. go to WPML -> Translation Management 3. Select all your Simplified Chinese content 4. In the box "Translation options" select "Duplicate content" near Traditional Chinese and click "Duplicate" 5. Check everything is duplicated as it should 6. You can now delete all Simplified Chinese content and remove the language if you wish
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