Missing commas at end of aria-labels

[microbit-robert]

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Description

There are no longer commas at the end of block aria-labels. This means NVDA (and probably JAWS) output information as "...has input statement" which might be confusing for some users. VoiceOver automatically places commas between the aria-label and aria-roledescription, so outputs "...has input, statement".

Should there be a conditional comma appended to the aria-labels where appropriate based on OS to improve screen reader output?

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