[JW Lua] Changing the undo text on the fly

[Jan Angermüller]

Jari,

is it possible to change the Undo Text at runtime ?
This may be necessary to make more clear which options were selected 
when running the plug-in.
For example by appending something like "(All Staves)" or "(Score only)" 
to the regular plug-in undo text.

Best regards,
Jan