Adding bold to the CSS for errors, means that the full error message will be ...

Adding bold to the CSS for errors, means that the full error message will be bold. Is that the desired outcome? Or do we want only items with a strong tag in the error message to be bold?

Yes @markconroy, Same we have done in the parent issue 3010558: Unnecessary element in Umami's form-element template may produce invalid markup.

<strong> may produce invalid markup. To avoid that we're adding bold to the CSS for errors.