TCurveMotorCol.DESIGNATION. Used other entries in the files to make a reasonable guess as to the "name" instead of the "designation", for entries using Latin alphabet. Left the old entries in, but commented out, for ease in comparison later.
rather than separating out the propellant data. This commit clarifies
the code by replacing instances of "propellant" with "motor" in
variable names and messages where appropriate.
It does not update the translations into other languages.