This thread is resolved. Here is a description of the problem and solution.
Problem: Compatible issue with Facebook Message Customer Chat!
1) Visit WPML>>Settings
2) Choose *Custom XML configuration* tab
3) Add the following WPML language configuration code in *Custom XML configuration* field
<wpml-config> <admin-texts> <key name="fbmcc_generatedCode" /> </admin-texts> </wpml-config>
4) Save the changes
5) Visit String Translation and check the string is registered for translation or not
6) Translate the String(with Facebook Chinese code for Chat)
Relevant Documentation: https://wpml.org/documentation/support/language-configuration-files/#admin-texts
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