This thread is resolved. Here is a description of the problem and solution.
Problem: How to translate fusion slider?
Solution: First doing the translation of the slider, then doing the translation of the slides. After that, editing the slide in the second language, then switch the option of "This is a translation from..."
Other way, if I change the image, it changes in both languages and doesnt do the translation. Now is ok! Thanks!
That's how this ticket was resolved by the user who uses fusion slider: https://wpml.org/forums/topic/problem-with-media-translation-in-a-slider/
The easiest way is please create two separate sliders. Each one for one language.
Now in your translated page, you can select the slider you want.
So basically you have to create 2 sliders for two languages.
This is the technical support forum for WPML - the multilingual WordPress plugin.