CRM-15066 fix - Choose to cancel one recurring contribution plan, but Civi cancels the other

https://issues.civicrm.org/jira/browse/CRM-15066
minor improvements
Clarify button labels
crmEditable - consistent treatment of action params
Merge pull request #3808 from colemanw/monishdeb-CRM-15066

CRM-15066 fix - Choose to cancel one recurring contribution plan, but Civi cancels the other