in the current version of Tempo Timesheets, it is not possible to edit the Planning or Timesheet approval mails. I do not have information about a date/verion when the above mentioned improvement will be released.
The only mail that can be edited is the mail sent by the Tempo Scheduler (https://tempoplugin.jira.com/wiki/display/TEMPO0714/Scheduler+E-mail+Template )
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