[Resuelto] String translations

Background of the issue:
I try to translate strings from for instance Directorist plugin. This is one example: enlace oculto at the listing grid Sortera Efter. If you open the filter Återställ Filter, Använd Filter etc. but in the string translation, the English is the default language. So when I translate, nothing happens.

Symptoms:
When I try to translate strings using WPML, the translations do not apply. Additionally, I can't click on some options in the string translation interface.

Questions:
Why are my translations not applying when using WPML?
Why can't I click on some options in the string translation interface?