Problem/Motivation
Actually when we want to export a single configuration file we have to manually copy and paste content on file manually.
Steps to reproduce
Go to url /admin/config/development/configuration/single/export and select a single configuration.
Proposed resolution
It would be helpfull to have a button to download the configuration file and avoid to manually copy and paste to the file.
User interface changes
Add a Download button in bottom of the page.