"SAP" stands for Secondary Audio Programming. It is a feature several TV shows include for their non-English-speaking audience. SAP is essentially a second audio stream included with your TV show that lets you listen to the show in a language other than the original. If you'd rather listen to the TV show in the original language, it is not that difficult to turn off SAP.
Turn on your TV and press the "Menu" button on your remote.
Select the "Audio" (or similarly titled) menu from the list of available options.
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Select the "SAP" option (it may also be labeled "MS"). Change the setting from "On" to "Off." You might instead have to select "Stereo" or "Mono" from a list of sound options, one of which will be SAP.