Default placeholder text per language

Being able to configure a default placeholder text for a Date Picker per language.

In our app, we are using Dutch as the default language setting and we are also using the corresponding default date format here (e.g. 23-04-2018).

However, when using a Date Picker widget with no placeholder text, by default the following text is put ‘dd-mm-yyyy’. The yyyy part is not in Dutch which confuses our customers.

This can become even worse by putting a custom date format in the language like ‘d MMMM y’ where an end user would have to know to enter ‘23 april 2018’ from seeing ‘d mmmm y’ as a placeholder.

We know it is possible in the Date Picker widget to put in a custom placeholder text.
However, as we use a large number of Date Pickers throughout the app it is almost impossible to maintain consistent quality here by having to change them all manually.