@adriana-pulicicchio: Our themes are translation ready but Spanish(Argentina) Translation file is not available for Foodie World Pro Theme. To translate those texts, you will need to add Spanish language file es_AR.po
which you can get by renaming the foodie-world-pro.pot
file in languages folder.
Then, just open that file from free software from http://poedit.net/ and check for words like Service, pervious and next the words you want to translate, change that and save it. It should work. You can also add other translations there as well.
You can send us the translated .po file and we will add it in our theme with you as a contributor for the translation.
Let me know if this solves your issue!
Kind Regards,
Skandha