Suggestion : 'Used For' column in Email Templates Grid

[apiuser]

Feature request from rbostan, posted on GitHub Oct 15, 2016

Preconditions

1. Magento 2.1.2

Steps to reproduce

1. No needs to reproduce

Expected result

1. If there is a column named 'Used For' for email templates, we can see our custom email templates more clear.

Actual result

1. No need.