Differentiate between different kinds of uploads

Knowing what kind of upload a thing is is useful.

And the information that is useful to show about each upload depends on
what kind of upload it is.

app/models/job.py

@@ -31,6 +31,7 @@ class Job(JSONModel):
         'notification_count',
         'created_by',
         'template_type',
+        'recipient',
     }
 
     @classmethod
@@ -57,6 +58,10 @@ class Job(JSONModel):
     def upload_type(self):
         return self._dict.get('upload_type')
 
+    @property
+    def pdf_letter(self):
+        return self.upload_type == 'letter'
+
     @property
     def processing_started(self):
         if not self._dict.get('processing_started'):