How can I change the language of the components in a configurable list?

How can I change the language of the components in a configurable list? I would like to change the labels and also the items showed in the combobox.

Unfortunately, at the moment widgets cannot be translated due to its structure, they are not added to the form like basic or other fields, instead they are added through iFrame codes and so far it is a bit hard to affect the webpage that loads within an iFrame code since it is not necessary part of the main HTML page (in this case the form).