We are working hidden link where wpml was already implemented.
Greek language is set as primary language.
I now try to translate "Ultimate GDPR" plugin using string translate.
The problem is that plugin's English strings as eg. "Save & Close" are declared as greek strings.
How can i translate the strings for Greek language?
You can change the main language of those strings so that they will stop being in greek and this way you can make them work the opposite. You can check multiple boxes so that you can change strings language in bulk. Just make sure that in case you already translated those strings, you first save the translations somewhere as they won't be there anymore after you change the main language of those strings. But that only if you translated that plugin's strings already which I don't think is the case.
Please take a look at the screenshot I attached from an example site.
You can change the default to be English so the other language will become Greek.
Please let me know if this solved your issue or if you still need help. ?