civicrm/civicrm-core — pull request #1783 by ravishnair (2013-10-11 08:30:31+00:00)
Title: -- CRM-13557 changes as per comment

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* CRM-13557: Contact Hash is appearing on manual merge screen and should be suppressed
http://issues.civicrm.org/jira/browse/CRM-13557

Removed "preferred_language" from the invalid array list as per comment in issue CRM-13557