bug#80734: Don't tell users *they* gave an improper argument

On 2026-04-04 22:25, Dan Jacobson wrote:
> 'Action failed. The system responded with "EBARF". Sorry.'

To my mind that wording is just as confusing as the original. Maybe even 
more confusing.

If we're going to make progress here, more legwork needs to be done, 
most likely along the lines I suggested earlier.