Merge pull request #4013 from dupondje/add_pdf_mapping

Map application/x-pdf to pdf

conf/modules.d/mime_types.conf

@@ -30,7 +30,8 @@ mime_types {
     ];
     pdf = [
       "application/octet-stream",
-      "application/pdf"
+      "application/pdf",
+      "application/x-pdf"
     ];
   }