GPII-723: Reading "speak text", "braille" and "contrast" applications

http://issues.gpii.net/browse/GPII-723
One doesn't need a 100% duplication to create a redundancy. Please could you refactor this into a suitable reusable utility in the gpii.ariaUtility namespace - thanks! At the same time, all of the body of  gpii.ariaUtility.getLabelId can be simplified to a call to fluid.allocateSimpleId, so I recommend that this function be removed.