Added more Message parameter functions

Similar to numParams(), added functions for other parameters
that can be formatted by the Language class. Adds functions for
expiry, size, timePeriod, duration, and bitrate parameters so
that the formatting doesn't have to be done at the caller.

Change-Id: I7b435fcc11824ead55e4c0f5512418187eae9a6f
Merge "Added more Message parameter functions"