LP#842991 Reports needs to error when deleting fails

When attempting to delete a report template, the reports interface
incorrectly shows "Action Succeeded" even when it partly fails. If the
user performing the delete does not own all the dependent reports and
outputs, then the perl function returns 1 to indicate that some were
deleted, but not all. However, the javascript that calls that function
does not check for a return value of 1. This commit adds that check, and
also improves the formatting of the related error messages.

Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Dan Wells <dbw2@calvin.edu>