Always happy to see another Dutchy here... Maybe one day there will be enough of us to make it viable to translate the Hubitat to Dutch
You will probably not need (or allow) your kids to touch the configuration interface of your Hubitat. Using Dutch names in your configuration does look odd sometimes:
But it works like a charm.
Your dashboard will be quite Dutch...
My kids can send commands via Google Home in Dutch and announcements from the Hubitat are also made in Dutch by Google Home... My kids never use the dashboards.
I only have two negative points. The Hubitat costs a lot over here! I Paid €240 for mine! Don't get me wrong, it's worth every cent, but what really bugs me is that more than half of the price went to postage and customs. And secondly, a lot of smart products in Europe are not known in America (Nuki for example), therefor not supported by Hubitat (yet). But that can be solved by using IFTTT.
Support in the community is GREAT! I'm very happy with my Hubitat!