I18n and locale changes does not apply to date time pickers

The vaadin-date-picker uses the correct translated texts based on the language provider, and also uses the current locale settings from the UI, but the vaadin-date-time-picker does not.

This is probably because the date picker has a default interceptor, but that does not applies to the date time picker.

Adding a new interceptor for the date time picker solves the problem, but if this is the right solution is debatable in the first place, because if the date picker is placed into a grid column, then it won't work for that case either. So for a bugfix the interceptor can be created, but later on some other solution is required.