Disney World has "Ears to the World" wireless headset language translators available on loan. You can choose from German, French, Spanish, Portuguese or Japanese. There is no charge to use the translators, however, a $25 deposit is required which is refunded if the unit is returned the same day.
The translators are available at Guest Services at each of the four theme parks.
Check out this article on Tips for Visiting Walt Disney World Without Speaking English!
Disney Show Translators provide translation for over 20 attractions and shows throughout the 4 Walt Disney World theme parks – you can view the current list HERE.
Another article that you may find helpful is The International Traveler’s Guide to Walt Disney World.