WPML Translate problem

I have problem with Availability label in my site. The product availability remains in Greek Language even i click on English button. Why? I didnt find any solution for this yet. I tried from WPML settings, from string translation. i delete the woocomerce Availability string (English) and now i dont know how i get back this string. But before i delete this string the Availability label still showing in Greek Language in English site. Why?

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