Hi Eduardo,
Yes, you can change the language file for these texts.
About the Team page, each section like: Goalkeepers, Defenders, .... is a module which loads articles from selected category.
For example with Goalkeepers module, on our demo site, it has a Joomla category called 'Goal keepers', each goalkeeper is an article in this category. If you have goalkeepers for different team, you can simply clone this category/articles and edit info for each article respectively.
Regards