I´ve just received an email with a link to look up the journey of my Z18. Unfortunately, dpds website default language is Polish.
URL: https://tracktrace.dpd.com.pl/parcelDetails?p1=<parcel ID>
When you change the language setting in the top-right corner of the webpage, the site wants a parcel ID. I extracted the parcel ID from the given URL to https://tracktrace.dpd.com.pl/EN/parcelDetails?typ=1&p1=<parcel ID> and got the website in English.
Maybe, this problem occurred only with my order (although, I do not have any relation to the polish language). Otherwise, I would recommend to change the journey tracking URL.
Hope this helps,