[Решено] "wpml_string_wrapper: content" makes me cannot complete the translation

Background of the issue:
I am trying to complete my translation but encountered an issue with the string "wpml_string_wrapper: content". Screenshot: скрытая ссылка

Symptoms:
I cannot complete my translation because there are two blanks naming "wpml_string_wrapper: content".

Questions:
Why are there two blanks named "wpml_string_wrapper: content"?
How can I resolve the issue to complete my translation?