Feature/a11y webform stepcounter

See ticket [A11y] WebformStepCounter en ARIA for more information

Changes

The screenreader is now giving step 1 of the 3 instead of just saying 1

how has this been tested

Screenreader test and with the uncinc cloud with yalc. For the translation if that is working correct

With yalc I tested if the location with the translation is working and if its not working it will use the hardcoded text. when the first item in the array is not found it will go in to the second item.

full code

aria-label={t(['webform.components.stepcounter.aria_label', `stap ${key + 1} van de ${pages.size}`], { number: key + 1, pagesize: pages.size })}