set custom title and header for admin sites

ippisite/ippidb/admin.py

@@ -23,3 +23,9 @@ for model in apps.get_app_config('ippidb').models.values():
         admin.site.register(model)
     except admin.sites.AlreadyRegistered as are:
         continue
+
+admin.site.site_header = 'iPPI-DB administration'
+
+admin.site.site_title = admin.site.site_header
+
+