If the specified image(s) should be localized (display in the appropriate language), then set this property to "True." Otherwise, leave this property set to "False" (the default).
If you are using localized images, then ensure that the correctly named localized graphic files are located in the same directory as the default file, and that they are named according to the standard Java Resource Bundle file naming conventions, for example, "billboard1_en.gif (for English), "billboard1_es.gif" (for Spanish), etc.