Music rest block units are potentially misleading

[microbit-robert]

We have received feedback that the (ms) units on the music rest block are potentially misleading when the default selection is beat.

While music.beat() returns a number in ms, this is likely not clear for a lot of users and can lead to confusion.

Should the units be changed to (beats) be default?

The units as (ms) make sense when the block appears as:

Loosely connected to this issue, it looks as though there should be a space between rest and the unit. beat does not appear as a plural when selecting a value greater than one: