This thread is resolved. Here is a description of the problem and solution.
Problem: I'm trying to translate some strings of "the grid" plugin, but i can't locate them in strings traslation.
Solution: It seems that you need to create a separate grid for the secondary language. Right now, you're using the same shortcode in both English and Greek language of the page.
As you can see on the General tab, the language of this grid is English. I think you should create a new grid, using the same settings, but select the Greek language for the Grid Language option. Then, go to the Filter/Sort tab, add the strings in Greek, and use the shortcode of the new grid on the translated page.
Relevant Documentation: https://wpml.org/forums/topic/strings-translation-the-grid/#post-5871753
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