Hi,
in order to avoid to modify Order/Show.php when cusomize HIKASHOP_ORDER string, may I suggest to put the ':' or 'n°' characters in that string and not in the show.php code.
It's not the same display in the Command Title and under the date, on the right.
Same for 'Date:' that in some countries you would prefer 'Date :'
We didn't do it because that means that we need to create more strings "date: %s" and "date", while doing it like we did, we reuse the translation. that way, translators have less job to do... The translation file a already quite big !