I wouldn't do this if I were you. You are trying to edit a view from a package which is risky as the package might update.
You could instead create your own dashboard with a list of entries and functionality to download them.
If you insist on this then you'd probably need an angularjs interceptor and replace the forms view with your own as described here:
https://nathanw.com.au/blog/customising-umbraco-without-touching-core-files/