This thread is resolved. Here is a description of the problem and solution.
Problem: GravityForms strings are not being translated, even if translation is included in the WPML > String Translation.
Solution: In this ticket, the problem is that the strings had been incorrectly entered in the language. In WPML > String Translation make sure that the string is registered in the correct language.
You can either delete the wrong strings or update the language of the strings in WPML > String Translation.
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