Allow Global Properties to be used in text descriptions of Self Service buttons

It would be helpful if users who don't have access to EM, were still able to see what certain values of global properties were. For example, we have a program that would run with a date parameter. This date is configured by another department, and can't be determined by any kind of a pattern that's defined in a frequency. It would be helpful if we gave them a button that could change this date, but we would also want to allow them to see the current value, right from the button's description text.

We could set up a separate process to notify them of the current value, but it would be easier and more accessible if it could be in the Self-Service module itself.