Thank you for your answer.
As I said, when I add new language (my language) and I enter it it is just empty. There are no translatable strings. And besides – no active Add or Del buttons so that I can create them. So the question is how can I create a new lang file with the strings from en_EN so that I can translate them.
Meanwhile, I also tried editing the en_EN file by translating it. Changes has not been saved.
I suspect there is something wrong here and I am not sure if it is in the plugin.
I can’t send you the theme here since it is commercial. So if you tell me for another way of sending it, at least to confirm whether you can edit properly, I will be grateful.
Thanks!