Date format

[j-norwood-young]

Please could you make the data format an environmental variable.

Eg. the placeholder hints are incorrect in our system in Edit/Create Subscription Type. The system hints dd.mm.yyyy, but we use yyyy-mm-dd.

[rootpd]

I think the format would be part of the locale that is necessary also for number formatting reported earlier. Placeholders will be harder though, those are hardcoded language strings :/. We'll need to figure something out there.