Merge pull request #21728 from yashodha/core_2766

(#2766) provide way to distinguish the core and custom fields…

CRM/Dedupe/BAO/DedupeRuleGroup.php

@@ -115,7 +115,7 @@ class CRM_Dedupe_BAO_DedupeRuleGroup extends CRM_Dedupe_DAO_DedupeRuleGroup {
             continue;
           }
           foreach ($cg['fields'] as $cf) {
-            $fields[$ctype][$cg['table_name']][$cf['column_name']] = $cf['label'];
+            $fields[$ctype][$cg['table_name']][$cf['column_name']] = $cg['title'] . ' : ' . $cf['label'];
           }
         }
       }