Change language?

Is there any possible way to change the language of the widget? The language is on English and I want it to be on Danish. I tried to edit the “easy-facebook-likebox.pot” and the “easy-facebook-likebox-pl_PL.po” files and overwritten the original files with the edited ones, but nothing happens? I also tried to use the WPML widgets but without luck.

Can somebody please help me if there is a possible solution on my problem?