This has nothing to do with translation or Spanish but I love the World Cup so here it goes anyway. I uploaded a calendar with the dates and times of each match. The calendar can be easily imported to Google calendar.
To import the dates, just go to Calendar Settings, then Calendar tab, choose to Import calendar and upload the following file: WC.ics
More options can be found at Markthidate.
Also, if you don’t have cable or satellite, Univisión is going to broadcast the matches (in Spanish) and they also have a live feed if you want to watch online: live feed!