This thread is resolved. Here is a description of the problem and solution.
Problem: How to Translate Contact Form 7
Solution: We have limitations to translate Contact Form 7 like other forms(for an example Gravity Forms). We have to duplicate the form in each language to make it translatable. Then we can edit the duplicated form as translation.
Relevant Documentation: https://wpml.org/documentation/plugins-compatibility/using-contact-form-7-with-wpml/
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