Flexible date format

[webzunft]

Just leaving this note to check later.
As a German who runs an EDD store in English, it would be helpful to have a different date format (01.02.2018 instead of 2018-02-01).

Does the plugin use the local WP format?
Even if not, we might want to use a filter to change it for our use case since our WP installation also uses the English date format.