Fix page type links when its label isn't set (#7) and remove the hardcoded German text

[viktor-yunenko]

This is hardly code quality that I would push to production in normal circumstances, but it works.

As I mention in #7 in the future I imagine migrating away from LinkType's and removing this code.

[sidneywidmer]

Hey @victor-yunenko 👋

Thanks for your propsed fix and your patience!

The template changes look great and the bugfix in the ModelLinkType is also nearly perfekt. I don't get why we need to check for pk in the changed real_value methods in the ModelLinkType and the PageLinkType?

if isinstance(self.link.data('value').get('model'), int):
    return self.model.objects.filter(pk=self.link.data('value').get('model')).first()
else:
    return self.model.objects.filter(pk=self.link.data('value').get('model').pk).first()

Wouldn't the following line be sufficient?

return self.model.objects.filter(pk=self.link.data('value').get('model')).first()

link.data('value') is supposed to hold all fields that the form contains (in the example of the ModelTypeForm the only field is model). Those fields are reflected in the value json, in our case {model: xyz }

The real_value is ment to be overwritten for everything special.

I updated the branch fix/fix/real_value with how I think this should look like, what do you think?