Dedupe rule creation should display labels of contact types, in case they have been customised
The dedupe rule creation screens always use the 'hardcoded' names of the contact types, even if you have customised the labels for these in Administer > Custom data > Contact types.
The change would need to be made on the listing page (https://dmaster.demo.civicrm.org/civicrm/contact/deduperules?reset=1) and the creating a rule page (https://dmaster.demo.civicrm.org/civicrm/contact/deduperules?action=add&contact_type=Individual&reset=1).
In the background it should still use the 'hardcoded' names, so that we don't regress https://issues.civicrm.org/jira/browse/CRM-21444 - but it would be nice if the correct labels appeared in the UI.