Recording error message not entirely accurate

[Jean-Francois Arseneau]

I know I'm really nitpicking with this, but while not entirely wrong, the error message given when you click on "Record" and there is no instrument could be more helpful by telling the user he needs to add an instrument, then arm it, to be able to record.

Steps to Reproduce:
1. Start Jokosher and open a project
2. Click on "Record"

The error message says:
"No instruments are armed for recording. You need to arm an instrument before you can begin recording."

Expected Result:
The error message should say something like, "No instruments have been added. You need to add an instrument and then arm it before you can begin recording."

[Laszlo Pandy (laszlok)]

Strings are frozen, so this will have to wait a while.