Reported for: WPML String Translation 2.3.8
Some theme option strings, depending on how they are registered and used, may not be showing their translation.
The problem occurs when the third parameter is used in the function
icl_t to register the string.
The third parameter is the original value of the string, and the strings are looked-up by that original value.
However, since WPML String Translation 2.3.8, this functionality has been removed and a new migration logic is supposed to handle these strings.
Our developers are working on a solution for this issue.