The 'Language' frame should contain the languages of the text or
lyrics spoken or sung in the audio. The language is represented with
three characters according to ISO-639-2 [ISO-639-2]. If more than one
language is used in the text their language codes should follow
according to the amount of their usage, e.g. "eng" $00 "sve" $00.
@author Eric Farng
@version $Revision: 1.4 $